W212 coolant leak. Done a flush before,my existing coolant was blue.

W212 coolant leak. Mar 28, 2021 · Quic update, the leaking coolant has been identified as a faulty water pump so that's being replaced tomorrow in the garage ( pending part delivery) . Nobody seems to know anything about them or replacing them. Nov 9, 2019 · Hello everyone, I had been enjoying my Mercedes E500 for the past 3 years until a month ago it started leaking coolant . Ignoring oil leaks can lead to low Mar 25, 2022 · I change the turbo on w212 Mercedes-Benz because i thot was leaking oil. Mercedes-Benz deems their engine coolant to be a "lifetime" coolant; however, experts unanimously agree that it is a good idea to occasionally replace the coolant as it does eventually break down and loses the ability to properly protect your engine. If you notice antifreeze dripping from the vehicle or the reservoir seems to be emptying, it’s time to fix your car. It advises on pressure testing the coolant circuit and recommends seal replacement if issues persist. So now the fuel filter housing is under scrutinyI have attached a pic, taken from the top, wiith arrows showing the position of the hoses , and so far nothing showing at this location. Jul 4, 2021 · Hi, the leak definitely contains coolant because having put a little uv dye into the coolant reservoir and driving a little the luminescence was evident with a uv torch. After reading this, I think it makes sense to address Oct 3, 2019 · Finding a coolant leak! (Mercedes Benz w204) Dec 1, 2016 · Panicking this morning! Please excuse the mechanical ignorance in my description, but I think I have a coolant leak. 5L V6 Coupe (2 Door) with petcock, radiator drain flush and burp Over time, the level of coolant in a car can naturally decrease due to evaporation or small leaks. Factory fill coolant is normally blue in color and it's listed as 150K mile or 15 years replacement for the 2011 MY. I originally tried replacing the header tank cap as I thought it was leaking however the issue remains. These leaks are often caused by the deterioration of gaskets and seals over time. MERCEDES AIR BUBBLES IN COOLANT ANTIFREEZE RESERVOIR TANK W204 W205 W211 W212 W213 GLC GLA CLA GLE If your Mercedes has air bubbles in coolant tank, bubbles in antifreeze reservoir and you want to Sep 12, 2023 · Greetings. Coolant Leaks A more serious cause is a leak in the coolant system. May 2, 2024 · My previous W212 E63 coolant tank sprang a leak, although it was difficult to spot until the engine came up to temperature . Based upon my experience at an independent specialist + forums / Facebook. Climbed on top of Sorting out issue with water leak on Mercedes E Class W212 with 220 CDI engine. My E class had a pinprick hole in the coolant reservoir that didn't leak until up to temperature and under pressure. Before beginning this step, make Jan 10, 2019 · DIY for OM642 Oil Cooler Leak PDF A document that provides detailed instructions on addressing an oil cooler leak in an OM642 engine. Look in there with a small light, you might find traces of evapoated coolant. Checked & there was oil in the coolant tank. Sep 7, 2023 · Run it up to temperature and check the coolant filler bottle and associated pipework for leaks. I have Jan 12, 2014 · Just noticed that one of my Transmission Oil Cooler Hoses is leaking a little. The culprit? Brittle hoses, including one from the thermostat to the aircon heat exchanger and another from the radiator outlet to the engine. So, every vehicle has a cooling system that can circulate the coolant throughout the engine for reducing the heat. The owner was concerned about potential overheating and wanted to know: Where does engine coolant go if there are no visible leaks? Step 1: Diagnostic Check The technician first performed a complete Feb 7, 2024 · Oil leaks from the upper front timing covers in Mercedes vehicles are a common issue that can be addressed with proper care and maintenance. org Forums Mercedes-Benz Sedans E-Class (W212) Engine oil drip/leak locations on M276 engine Aug 24, 2017 · I have a sprinter and I had a leak where the rear heater is on one of the pipes. Oct 26, 2019 · Hi all, It seems that I have an oil and coolant leak from oil cooler on 2010 E250 CGI W212 M271 1. May 12, 2021 · But coolant level keeps going down very slowly with mileage. Look for dried coolant on top of the inlet manifold. It starts with the key being in ignition mode but also carries along when the engine is on. . There is a dribble of fluid under the car. Always address small leaks early If your Mercedes Coolant level warning comes on the cluster it's possible that you have a coolan leak. My 1st question is: What should I replace? - the entire plastic assembly including the water pump? - just Aug 1, 2022 · Coolant Leak - W212 65 reg OM651 engine - Head Gasket? Bassmonster Mar 31, 2024 Mar 31, 2024 #1 Aug 19, 2024 · Coolant Leak from Engine: A Case Study in Mercedes-Benz E Class W212 with M274 Engine Vehicle: Mercedes-Benz E Class W212 Complaint: Coolant Leak from Engine A coolant leak from the engine is one of the most common yet critical issues drivers may face. Feb 6, 2022 · Hi all, Car: 2010 W212 E250 CGI. Offered to Jul 14, 2011 · Is there any instructions for removal of that black firewall type thing running along the back of these cars? It's a stupid plastic hose that has a crack running down the center of it. Ethylene glycol (the main ingredient Aug 30, 2018 · Similar threads M Coolant leak 1985 280SL M110. Later on i started noticing dripping from around the back side of the engine and it starts leaking coolant after driving for about 30 minutes. Dec 24, 2019 · I've cobbled together some info on how to complete a coolant flush and fill for a m276 motor in a 2013 E350 sedan. One common problem reported by many owners is a coolant leak from the water pump. It includes step-by-step disassembly and reassembly procedures, highlighting the removal of several engine components like the turbo and intake manifolds. Jul 25, 2022 · In a way good you can see coolant leaked into the under tray as it shows it's an external leak and is a start towards locking the source. Free video to see how to fix minor coolant / antifreeze leaks in a 2010 Mercedes-Benz E350 3. Swipe to see the transformation! 🔧 2️⃣ Leak Detection: Using our coolant pressure tester Mercedes-Benz M272 V6 Engine Oil Cooler With Oil Filter Housing W203 W204 W211 W212 W207 W221 W171 2721800510How to replace mercedes e class leaking oil hous Feb 27, 2015 · Coolant top up warning light came on early February 2015 at circa 39,500 miles. Lewin Day Read expert Mercedes-Benz E-Class w212 and AMG radiator problem guides and repair how-tos with photos and videos to help you maintain your cooling system. The OM651 Engine, known for its performance and efficiency, has a few Mar 12, 2018 · Hi Mow221, If the coolant is leaking out of the filter heater ( yellow circle ) where is it going to? Down the side of the engine and on to the road?? Oct 16, 2020 · Replacing Oil Cooler Seals on M271 PDF A document that provides step-by-step instructions on replacing oil cooler seals for a vehicle with engine type M271. The oil cooler assembly on the four cylinder diesel motor (E220 and E250) have a habit of developing leaks. It is necessary to replenish the supply during a 24-hour period. Good thing though is that after having so much off and replaced there aren't any major problems. That is why I thought Freeze plug, but Jonwhite99 told me to check out the short water pump hose and that was the culprit See my post below for more info! W212 OM651 E220 Coolant Leak - Fuel Filter Housing - Common ProblemIntroduction Whilst this problem is not just limited to the E Class, it is certainly a common problem on the OM651 engine. My E Class Estate started losing coolant a few weeks ago. Checked it today with some die. It often goes unnoticed as coolant leaks go. Hi everyone. Proper diagnostics and OEM replacement restored the cooling system’s integrity. Oct 13, 2014 · Hi All I have a 61 plate W212 E250 purchased as an approved used, I've had it for nearly 12 months without issue, a couple of weeks ago however I got a coolant warning light come on, took it into the dealer who topped it up, they were too busy to do any further checks. The owner was concerned about potential overheating and wanted to know: Where does engine coolant go if there are no visible leaks? Step 1: Diagnostic Check The technician first performed a complete Nov 6, 2023 · I want to share a reasonably easy solution to a coolant leak that I had. Cracked engine blocks: Engine Aug 13, 2025 · Learn how to diagnose and repair Mercedes cooling system problems guide with real case studies. Cleaned the Dec 14, 2020 · Hi can anyone tell me is the a common place were your merc e220, leaks coolant, my car is losing a bit of water iv had a look around but can't see any were that stands out as a leak it's the W212 engine ? Mar 12, 2018 · Funny thing is we don't know if the small coolant leak is fixed, time will tell. Warning light came on about 10 miles from the office this morning, I didn't think much of it other than I'll order some online and top it up once it arrives. Found evidence of coolant leaking out of reservoir, with gas leak sound coming from reservoir cap. 5L V6, W166 Chassis). Most common coolant leak on this engine. I cant see it leaking anywhere, even though I have put UV leak finder into the water. Topped up and at 40,000 miles the warning came on again :( MB Bromley diagnosed the leakage to the water pump. Smell of coolant and then when the plug corroded thru completely coolant was straight out it as quick as u could put it in burning away on the exhaust. Aug 20, 2024 · Coolant Leak from Water Pump in Mercedes-Benz E Class W212 (M271 Engine) The Mercedes-Benz E Class W212 is well known for its engineering excellence, but like any car, it can develop mechanical issues over time. Proper diagnostics and OEM replacement restored the cooling system’s integr r/mercedes_benz Current search is within r/mercedes_benz Remove r/mercedes_benz filter and expand search to all of Reddit Feb 22, 2018 · I have noticed an oil leak coming from the Gearbox Transmission Oil Cooler - part number A0995002300 (seems to be similar to A0995001100 used on the W212 also) The car is a W204 C220d auto 2014 with 150k miles. Close the valve and refill the bucket to repeat as needed. If not, you have a leak somewhere. Coolant level appears slightly down but not significantly. Dec 4, 2024 · The bulletin provides a remedy involving checks for external coolant leakage, inspecting spark plug holes for cracks, and checking for coolant in engine oil. Dec 30, 2018 · For a 2014 E350: Old friend called me with Check Engine light complaint. Aug 16, 2024 · The Case: Mercedes-Benz E300 W212 Coolant Drop Vehicle Details Model: Mercedes-Benz E300 W212 Engine: OM651 Complaint: Coolant level in the expansion tank was dropping without explanation. The component was procured and subsequently installed. Every time I do tho after driving 30 mins in the hot 113 degree Vegas weather I would shut the car off and suddenly find a puddle of coolant Jun 5, 2024 · I bought a 2011 W212 E350 Bluetec OM642 V6 CDI/Diesel at the end of February. Still trying to source the part. Mercedes-Benz W212 leaking Coolant easy fix. Friend claims it’s leaked before. I thought it was the water pump which I replaced a couple of days ago and the car is still leaking Aug 25, 2024 · Strawberry Milkshake of Death due to a leaking external ATF cooler (W212 OM651 722. It also includes images illustrating the parts involved, such as oil hoses and Aug 29, 2009 · Coolant loss can be internal or external, if you have no coolant coming out of the engine, then its making its way into the postons. 45 minutes maximum to replace. The result is frequent overheating warnings with no oil or coolant spillage on the driveway. Could I of got an airlock ? I’ve checked for sludge in oil and oil in coolant can’t see Apr 30, 2010 · Hi I have just purchased an E350cdi coupe, jan 2013 registered. If a small leak develops in this metal cooler, the cooling system pressure will force coolant thru the leak into the transmission. Low coolant alarm. Discover common problems of the Mercedes E-Class W212 E 400, from oil leaks to electrical issues. Problem: Coolant leak from the bottom side of the radiator where the plastic side meets the radiator core. They too are puzzled at the failure for such low mileage and well maintained car. Recently, Ive been having to constantly refill the coolant reservoir on my car because the coolant level message would come on. Oct 23, 2024 · Hi I'm after some guidance please! 2010 W212 E250 CDI has developed a serious coolant leak. Coolant leaking into the engine Check the coolant level of the car you are interested in. How To Fix Mercedes Coolant Leak Repair | Mercedes-Benz Turbocharger Coolant Line - From Water Pump to Left Return Line | ML63 AMG | How To Fix Mercedes W166 Jun 25, 2020 · The expansion bottle cap has a pressure release valve, and a seal. Leaking coolant / antifreeze is one of the more common types of leaking fluid from E350 engines. Read on to learn how to diagnose and fix a coolant leak. Some common engine-related causes of coolant leaks in Mercedes vehicles include: Worn-out engine gaskets: Over time, engine gaskets can deteriorate, causing coolant to leak onto the engine block or cylinder head. The pic shows where my leak is. I saw a Jun 11, 2006 · Coolant Leak - W212 65 reg OM651 engine - Head Gasket? Bassmonster Mar 31, 2024 Engine Replies 13 Views 2K Nov 7, 2024 Aug 25, 2024 · For instance, if the manifold is leaking coolant, it can cause overheating, which might damage the engine. Get insights to maintain your E-Class W212 E 400. Subscribed 43 5. 00 There is no difference in it from the original Mercedes one. Additionally, unburnt fuel due to improper air mixture can lead to carbon buildup, which may clog the intake manifold or damage other parts of the engine. The M157 engine in the W212 E 63 AMG is prone to oil leaks, particularly around the valve covers and timing chain area. Radiator leaks can lead to an overheated engine Jan 14, 2025 · Explore common causes of coolant leaks in the 2012 Mercedes-Benz E350, including loose hoses and water pump issues. Coincidentally the past while I have heard a bit of a rattle on 50% of the time on cold start-up Dec 20, 2022 · I know the cylinders are basically entirely surrounded by coolant, but I feel as though if it were a headgasket issue, they'd leak down into the cylinders, or onto the exhaust manifolds, where gravity would be pulling them. I believe I am having an intermittent issue where when my AC dumps a large amount of condensation after I’ve been driving for 20 minutes or longer, it starts hitting something hot (either the exhaust or the Jan 14, 2025 · Explore common causes of a Mercedes-Benz E350 coolant leak, including hoses and water pump issues. 5 litres every 1000 miles or so). However I then pulled Nov 27, 2023 · Hello guys I got a pretty bad coolant leak right under the driver side on my ML350 4Matic (M276 3. Also guys. I couldnt have put the fuel filter housing on wrong. Jul 1, 2015 · This article applies to the Mercedes-Benz E-Class AMG (2002-2009). This is done on a 2011 Mercedes Benz E350 Bluetec W212 CDI or Bluetec with engine model OM642. Got the new part and my mechanic is away but fitting in 2 weeks. Get repair estimates on RepairPal. In this guide, we cover the top reasons for a coolant leak. There'd been a slight leak for a year or two (63 plate CLS250 CDI) which became more noticeable after a long run - the air-con condensate was washing the collected oil out of the undertray onto my drive. I'm going to change it due to it been top up with just water after a little leak, so the coolant will have been diluted, do you by any chance no how much the system hold then I no how much coolant to get ? Aug 15, 2015 · Sunday at 10:10 AM periclasegreen350 B OM642 Oil cooler seals replaced, now coolant leak Brenthornn Nov 30, 2024 Engine Replies 9 Views 2K Jun 8, 2025 Dec 18, 2024 · The system ought to hold vacuum. Done a flush before,my existing coolant was blue. What’s that down there that leaks coolant? The ribbed hose looks too big diameter for coolant but If you have problems with the coolant circulation pump on Mercedes W212 E Class always check this relay first. Jul 20, 2025 · Engine-Related Causes The engine is the heart of your vehicle, and it’s not uncommon for coolant leaks to originate from this critical component. So i decided to replace, bought the cooler with new pink coolant. Watch this video on how to find and fix these leaks. I bought the manifold from maxpeedingrods for approx £60. If ignored, it can lead to engine overheating, loss of performance, and even total engine failure. If you buy new hoses you get new seals, but I believe you can get the seals direct from Merc for not much. Any help would be Follow the steps in this video to see how to fix minor coolant (antifreeze) leaks in your 2012 Mercedes-Benz E350. My coolant is not bright green anymore and temps seem a bit high. Have driven the car over 600km & the engine is not Jul 13, 2014 · Nary a one. check all of the rubber hoses and make sure nothing is leaking to the outside, if there is no loss to the outside, you blew up a hadgasket again or you cracked your block. 8T VIN: WDD2120472A296740 The oil and coolant are dripping down the left hand side of the engine block behind the starter motor and a bit further up. I’m dealing with an overheating issue on my 2012 Mercedes-Benz E350 4MATIC (V6, M276 How to replace fuel filter housing on Mercedes C220 CDI OM651, (coolant leak) Aug 16, 2024 · The Case: Mercedes-Benz E300 W212 Coolant Drop Vehicle Details Model: Mercedes-Benz E300 W212 Engine: OM651 Complaint: Coolant level in the expansion tank was dropping without explanation. On the other had, this is a new noise that has appeared few days ago along with the leaking coolant. Jun 19, 2022 · Hi guys my 2010 E class displays top up coolant message. Unfortunately, Mercedes does not use a radiator cap on the E-Class, nor can the stop leak be placed inside of the coolant expansion tank because it will not properly circulate. If you can add to the list, please comment and will happily add to it. I'm going to attempt to fix it tomorrow and get some MB coolant while I'm at it. Regular top-ups are required to maintain an adequate coolant level. 1K views 9 months ago #w212 #eclass #v8 2014 E550 M278 Driver’s Side Rear Engine/Firewall Coolant Leak Fix more May 20, 2015 · Mercedes-Benz E-Class: How to Flush Your Radiator Keeping your E-Class cooling system in optimum condition is important because the coolant performs four important functions: Protecting against freezing, protecting from over-heating, reducing thermal stresses in your engine and radiator, and improving cabin heater efficiency. Flushed the system a few times & put everything back together. If vacuum is good, bring over a bucket of fresh coolant and place the coolant fill hose into the bucket. Was the new water pump a genuine Mercedes part? Nov 4, 2021 · I recently noticed blue/green residue on the engine which appears to be a coolant leak. Learn how to flush the radiator below. My fuel filter housing looked ok when I changed it. I brought it back to the dealer after repairs and they did a pressure/leak test on coolant system telling it's all right. Dec 8, 2024 · “🚗 Coolant leak repair process” 1️⃣ Before & After: We worked on a Mercedes E-Class E250 W212 (Recond from Japan) with persistent coolant leaks. Hoses can be damaged by age and oil leaks. Mechanic changed oil cooler & also found a coolant leak in the fuel filter housing so changed that too. My car was leaking coolant from the water pump so i replaced it drove it for a week. Feb 9, 2023 · 2011 E250 . I think this is common problem that is why the new part is more stronger 🤔. ( Started to attempt the fix myself but was a bit much, was worried I wouldn't get the hoses all back on) The leak seems to have speed up recently, probably get 2/3 In this video we will show how to locate the coolant leak and remove and replace / change the fuel filter housing on Mercedes with engine OM651 which is on C220 CDI, C250 CDI, E220 CDI, E250 CDI Aug 8, 2016 · I have a 2013 E220 that seems to have developed a slow coolant leak (requires around 0. High engine temperatures and pressure exacerbate this wear. Upon its retur How to flush the coolant antifreeze in a 2010 Mercedes-Benz E350 3. Upon contacting the MB dealership in Blackburn I bought the Follow along as I go step by step on saving you a lot of money by fixing a common leak on the Mercedes C Class. I Mar 12, 2018 · Might be worth checking the seal 305 between the cooler housing 300 and the top plate 320, if this seal is leaking, coolant can get into the EGR cooler and into the inlet. Aug 19, 2024 · Engine Is Leaking Oil in Mercedes-Benz E Class W212: A Case Study Oil Leaks in OM651 Engine OM651 oil leak is a common issue many Mercedes-Benz owners face, especially in models like the E-Class W212. Regular inspections, quality replacement parts, professional expertise, and timely repairs are key to preventing and resolving oil leaks, ensuring that your Mercedes continues to deliver the performance and luxury that it's known for. 6) hello everyone and welcome back again to another awesome video. When the oil cooler was being changed we could see a LOT - of bars stop leak in the cooling system. The e250 vehicle in question is experiencing a coolant leak. Top cover off and could hear it from back of engine sort of under turbo /exhaust area. Aug 13, 2025 · Learn how to diagnose and repair Mercedes cooling system problems guide with real case studies. Possibly the seals on the radiator top hoses. I believe I have located it to the coolant pipe that sits over the top of the turbo. The fitting can be seen (with difficulty) if you look down between the two bulkheads directly under the windshield wiper motor. I have noticed a few spots of oil on my driveway and seems to be getting worse. Today I repair a Mercedes Benz AMG E63 with a common problem, ( aside from the turbo cooler lines ) is the heater hose coupler located on the back of the driver side cylinder head Jul 5, 2011 · It's ok. I was attending a GTG at BOTG the following day so got my local indy to order and change the tank. Car runs fine, engine temp has always been ok. Oct 17, 2022 · A Sneaky Coolant Leak Could Be the Slow Death of My Mercedes E-Class After flushing the cooling system, I'm still concerned a corroded freeze plug will ultimately kill this car. I recently replaced my inlet manifold. i have to top up the coolant everyday. Radiator brand Valeo A2045002803 Does anybody know how to get the radiator out please? I have tried getting to it. Sep 19, 2016 · i think is the water pipe leaking, change the water pipe to solve the problem. Symptoms of a Bad Coolant Hose Common signs of a bad radiator hose are leaking coolant, low coolant light, engine overheating, or a collapsed or damaged radiator hose. Car is. Jul 9, 2024 · Mercedes E-Class W212 overview engine options, reliability record, common problems, and smart buying tips for this 2010‑2016 luxury sedan. Open the coolant valve and watch all the fresh coolant get sucked in. When I checked the expansion tank it was about half full. A week later, I turned on the car and heard sounds of water splashing Jul 26, 2021 · Hi all, I've got the coolant leak from the fuel filter housing. Seemed to come from below the oil Oct 22, 2018 · You likely have a slow coolant leak from the fuel filter housing which attaches to the side of the cylinder head. The coolant is pooling in one area and I have checked the rest of the car and cant see any other coolant signs. I have kept my old manifold, as all that is wrong with it is the expected Apr 1, 2024 · MBWorld. May 28, 2014 · Just sharing my experience chasing oil cooler leaks. I don't believe coolant passes through the intake manifold on these, so it's probably not intake manifold gaskets. Dec 1, 2018 · Hi, so I have finally found what I think is the source of my coolant leak. Little by small amount of leaking fluid evaporates, leaving you with low coolant in the reservoir. Feb 27, 2020 · The most common cause for coolant in the transmission is a failure of the transmission cooler inside the radiator. Is this a possible DIY?? Aug 30, 2020 · Why do you need the change the coolant. Honestly I think that or the leak is so little that it's not detectable in minutes with the pressure gauge, or there's a minor head gasket leak of coolant. I have 86k miles. Looks like it's leaking from the pump itself as there are splashes all over the place. My Mercedes 2011 W212 coolant tank water is leaking into the Cylinder number 2 and making the car Jerk. The transmission fluid is cooled by pumping it thru a metal heat exchanger inside the left side of the radiator. The common areas to look for leaks in a Mercedes are the coolant tank, coolant reservoir cap, radiator, and hoses. Many a time we come across the customer complaint of coolant light coming on, but… Mar 25, 2024 · The "top up coolant light came on during a long drive, when opening the bonnet I realised I had some sort of coolant leak. Jun 7, 2019 · W212 AMG - 2010 - 2016 Mercedes Benz E63 AMG (W212) forum discussion, how-to guides, and technical help. Many owners report oil spots under their parked cars or notice a burning oil smell while driving. 2010 w212 E350 Opened bonnet and could like a noise which I could tell water water/steam coming out. Due to many reasons, you will notice the coolant is leaking from the radiator. The instructions include specific tools needed, such as oil hose clamps, and detailed procedures to drain coolant, remove the oil cooler, and install new seals. I think I have located a leak visually and have attached pictures of May 12, 2025 · Mercedes coolant leak? Learn what causes it, how to spot the signs, and smart steps to fix it before it leads to engine damage or costly repairs. Could a hose come off from the bottom because I can see fluid leaking from the undertray of the engine passenger side. It first gave me the warning on the dash saying that the coolant was low. The crimp weakened, I believe. A Mar 19, 2013 · This morning I got a message low coolant leak just after starting, topped it up and here is what I saw - photos taken from underneath left hand side That’s the only wet place in the engine bay. If the cap is leaking, the possible causes are: - Leaking seal - Engine overheating causing the pressure release valve to release coolant - The pressure release valve if faulty ans releases the pressure too early, or it may have a crack If opting for a new cap and seal, make sure you match the MB part number, because different Jul 2, 2015 · Step 2 – Partially drain the coolant and add stop leak Typically, adding a stop leak product to the cooling system involves pouring the contents into the radiator via the radiator cap. May 24, 2021 · One very common coolant leak area is the small plastic fitting that carries coolant from a heater hose thru the "false" bulkhead - the bulkhead that you see behind the engine. There are a few usual suspects, namely the coolant pump or thermostat housing, but one of the more common ones was to find the leak coming from the fuel filter housing. My car w212 2013 F/L m274 was leaking coolant from the water pump so i replaced it drove it for a week. Click links below for tools and parts used. This was after 2 months of ownership. The oil cooler went, and the garage repaired that - all good. it’s good for 15 years. Upon checking the coolant is just below the level of the sensor. My old code reader doesn’t display code. The starter motor is in the way of oil cooler Aug 20, 2024 · Coolant Leak from Water Pump in Mercedes-Benz E Class W212 (M271 Engine) The Mercedes-Benz E Class W212 is well known for its engineering excellence, but like any car, it can develop mechanical issues over time. Please see pictures attached. I had it flushed about 2 years ago at a oil change shop since it was so discolored. org Forums Mercedes-Benz Sedans E-Class (W212) Leak in engine coolant line that heats windshield washer reservoir Remove-Install False Firewall or bulkhead aka heat shielding Dec 25, 2018 · Similarly if the leak is very small (a weep as opposed to a leak) there is insufficient pressure in the coolant system (which is typically limited to 15psi by the coolant cap) for coolant to enter the cylinders and appear in the exhaust as steam. 5L V6 Coupe (2 Door). It even has the same casting numbers. Since getting the car I've done 30,000 Dec 26, 2013 · Dear all, I have a slight leak from somewhere around the coolant pump. I then took it into Oct 24, 2023 · Many a time we come across the customer complaint of coolant light coming on, but no obvious leak. I checked under the bonnet and there is oil underneath the air filter batwings, a little under the turbo seals and also at the back of the Feb 9, 2019 · Two major problems, the first being air in my coolant system I cannot purge (no heat!), but the one that is really pissing me off is my leaking thermostat housing. Mar 3, 2011 · Good evening ladies and gentlemen, I recently posted a comment on another member's thread about the coolant leaking on my 60 plate E250 CDI, where one would have to top it up about every 2 weeks. Engine coolant (which is also called antifreeze or anti-freeze) moves through the inside of your E350 engine and keeps it from overheating. Looks to be dripping out from the back of the engine area. For this model I had to remove a lot of extra stuff just to make more room in the front and in the back. is there any oil in your coolant? Mar 4, 2019 · Coolant hose failure can lead to major problems and cause the destruction of your engine if not caught in time. in this episode we had a mercedes benz w212 e250 cdi with a major oil leak coming from the en Jul 1, 2012 · Hey guys, I have a problem. Sep 12, 2024 · Coolant mixing with engine oil in your Mercedes? Discover the common causes, warning signs, and how to diagnose and fix the issue before it gets worse. Resolved a leakage issue caused by a faulty hose on this W212 E350 (2014–2015). Oct 25, 2023 · When you go to look later, all you see is some white smudges or perhaps a little stray crud near the thermostat. I think they is coolant leaking from somewhere after I have put everything back. For luxury vehicles like the Mercedes-Benz E Here's a list. its common in w212. The car would empty the expansion tank within 2 to 4 days so it's pretty bad. We also show you how to Nov 13, 2019 · Hi guys need help my oil filter housing is leaking on my 2014 e220 se cdi saloon I’ve got the new o rings from Mercedes direct just need advice on how to remove it please as it’s a bit tight to get in Sep 10, 2022 · You need to establish exactly where the leak is before you do any buying. Its linked to the engine coolant system in order to heat the fuel before it reaches the injector pumps but some of these only had two remaining bolts instead of 3, so they tended to leaks Happened with my one. Check out how to diagnose a coolant leak on your Mercedes C-class with this easy to follow video! Also, if you need instructions for replacing the water valv Jul 18, 2025 · E-Class (W212) - 2012 Mercedes E350 (M276) ? Overheating, No Engine Code - Hey MBWorld Family, I am new in the forums and I have been searching, reading everything about my overheating problem but couldn't find a related problem. What starts as a small oil stain under your car can quickly turn into a serious mechanical problem if left unchecked. Jul 10, 2025 · MBWorld. Covers overheating, coolant leaks, and oil contamination. All that is missing is the Mercedes part number. Not too difficult, everything is fine now. I spoke with an expert who determined that the cause of the problem is a leaky water pump. Find repair estimates and maintenance tips on RepairPal. The first diagnosis was the water pump failed and i was advised to drive it till its completely shut . Checked the Oil cap and it looks clean free of mayo dipstick also free Mar 12, 2018 · UPDATE: I figured out the coolant loss- it was the orange gasket in the spanish video- part number A6511420281 now its fine-took me 3 days to find the leak! i used a gasket maker on it because the original orange gasket has shrunk in size slightly so it was not sealing- its still fine with May 30, 2022 · A common cause of water leaking or Vanishing, on the OM651 engine is the fuel filter housing leaking where it joins the block. 990 MistyMerc Oct 30, 2023 Engine Replies 2 Views 478 Oct 30, 2023 MistyMerc M W212 coolant leak KingAky Sep 7, 2023 Engine Replies 12 Views 1K Sep 21, 2023 KingAky V Very strange oil leak w638 vclass v230 petrol Vclassv230 Oct 29, 2023 Engine Replies 2 Views 464 Oct 29, 2023 Vclassv230 V S Mar 9, 2023 · A coolant leak has a distinct smell and color, making it unmistakable from other fluid leaks. Coolant / antifreeze can leak from the A coolant leak in your Mercedes-Benz can cause serious engine damage if left unaddressed. I bought a Behr thermostat + gasket because my thermostat came out in pieces when I took the housing off during my water pump Jul 5, 2011 · I have a w212 Mercedes 2012 e class salon e250 diesel with an oil leak we have had a look and i think its the oil cooler seals have gone now im sure this isnt an easy job as i have got the cooler and filter housing can anyone point me in the right direction of doing it DIY is there a guide Feb 13, 2014 · Unless you've had your coolant replaced it should be blue. Mar 12, 2018 · Hi pmcgsmurf, I have a very small coolant leak in my w212 Om 651 200 CD1. It probably does not leak when shut off, but the leaked coolant will drain back and down for awhile, Also the engine gets warm enough to evaporate a little coolant under the hose. Feb 22, 2010 · I just lost all my coolant last night. Brought the car over. If you keep driving with a bad thermostat or a leaking thermostat gasket, the problem continues. Jul 26, 2018 · The leak started as a coolant low warning on the dash maybe once a month then got to what you are describing. Jan 23, 2019 · As above guys oil cooler leak, coming from where the hoses go into the cooler on the top, oil drops on the under tray, maybe a leak under the cooler ? Cannot see, anyone had this? How much a fitted fix? See on eBay the cooler is around £100?? Dec 28, 2016 · I have a slow weep from my oil coolerI'm struggling on google to find almost anything on this for the procedure I believe coolant runs through this and the only info I can find is that long-term it can cause the oil and coolant to mix. Jul 18, 2025 · As I've experienced the 212 now for a number of years, here's a compiled list of common problems and a minor insight into them. I fixed the leak topped up with coolant and no issues for a little while but now I keep getting the coolant light appearing. 81k miles. Its coming out the "freeze plug" which is screwed into the engine as far as I can see. I added coolant and the message Dec 9, 2022 · Worked fine for three months,and another one (pipe from right side start to leak. so i just parked it My car has an automatic transmission. I figured it out. tsann tpugukhk wvniecu bvaocl bqfumrk mzkdkj tdpck itdex jwpdo jrjzzq