Mercedes c200 cdi coolant leak. I have a 2009 year c class w204. If this is the Hello members, I have an issue with cooling system. However he says that you have to replace the whole housing and this would cost with parts and labour A$1400. Done a flush before,my existing coolant was blue. A coolant pipe was seeping the coolant slowly A coolant leak in your Mercedes-Benz can cause serious engine damage if left unaddressed. I have a 2009 W204 C250 CGI (petrol) with 125k on the clock. but I'd keep far away from any mechanic who recommends putting anything other than the approved antifreeze in the cooling system . I replaced those, and everything seemed fine. When i contacted Mercedes Benz dealership to purchase coolant this year, and specified green,they said to me,are only two types,blue and pink,and blue is discontinued,and the color changed, become greener with time. These engines are notorious for coolant leaks from both the plastic water pump and the coolant outlet on the cylinder head that holds the fuel filter. Car A Rac presents recommended by manufacturers types for all popular vehicles. The mechanic advised that the water pump I don't know about the OP's engine, but some type of engines have a 'heat exchanger' (a small internal radiator that runs engine oil through coolant), and when it leaks will cause coolant to escape into the engine oil. Parts Required: Oil housing seal, thermostat seal, coolant, oil Performance Gain: No leaks Complementary Modification: Oil and filter change. There are puddles of coolant in the housing's recesses, but with the engine running I don't know if the movement I'm seeing is the leak or just engine vibrations. Use a torch/lamp to see and check for any leakage top up any coolant, take for a test drive all good Did a "Check coolant" or "Top up coolant" message appear on your Mercedes' dashboard? If so, it's probably time to add coolant. We're losing slight coolant on our W204 CDI 2. The connections at the radiator and water pump may leak if they are damaged Does the coolant boil? I. Anyway, fast forward some 5 months later, and the same thing has happened again. I replaced the water pump myself, and just top up with coolant (old one,blue)still had left one litre. I own 62 reg prefacelift E200 CDI (om651. I got that replaced. They replaced the coolant Hi folks, Just after some help. A couple of weeks ago I took it to another mechanic as the coolant is still leaking. Mercedes use the extra extended life coolant. Hi All, I'm dealing with a common issue on my W204 OM651 engine, the oil cooler/filter housing leak, and I'm looking for advice on the best approach to fix it. 00. About two months ago I did a long run 250 miles soon as I got home the coolant light came on. Learn how here! Hello, I would be grateful for any help/ advice. Does anyone know what parts I need to buy to fix this? From the images I've taken I can't be sure where the leak is Do check your coolant level please. Mercedes w204 c200 cdi coolant leak akiiraja96 Jul 28, 2025 Parts, Maintenance & Servicing Replies 5 Views 275 Jul 29, 2025 Please see our article on draining and flushing your coolant system. Just check your overflow resovoir to make sure its got the right amount in it. Its a sealed system so should only need topping up if something like for example a water pump leaked. The engine coolant is low, and is giving me the message on the dash. I have checked the engine coolant I bought a repair kit, replaced the tiny O rings inside the transmission oil cooler ,and put a bit of radiator tape around the oil metal pipes. The dealer says he will fix this, which he suggests can be solved by adding air-con fluid. So i decided to replace, bought the cooler with new pink coolant. I know these cars can have oil leaks around the oil filter housing often enough due to improper sized oil filter o-rings or worn o 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 ? Mercedes W204 Coolant Leak (Diesel Filter Housing Replacement) & Infamous Steering Lock Issue DELETE Ricer Benz 8. Please see pictures attached. Hi all My mums 204 250cdi has been leaking coolant for long enough now that I have been able to spot the leak. If you see no leaks when the engine is cold, then wait until the engine is hot and then check. I have 160K My OM651 C250 CDI (2009, 105k) has decided to start loosing coolant again, on about 1l a week /120 miles atm, but its quickly getting worse. One oil leak is left and I try to locate it first myself. 925 variant C200 cdi came in with a coolant loss issue, carried an investigation and found that the radiator has tiny leaks which allows coolant to escape in a gas form (vapour). Your car has plastic shielding under the engine and radiator so it's leaking out of whatever holes there are in the shielding. Don't give your hard earned money to What kind of problems does a Mercedes W204 usually have? In this blog, we’ve outlined the most important things you should watch for when you’re in the market for a Mercedes W204. Worked fine for three months,and another one (pipe from right side start to leak. Heater works normally, no coolant smells Hi, Workshop changed engine head gasket 4000km ago and fluid leaks have been tracked down since. Specifically, I want to know if replacing just the seals is sufficient or if I There are some common leak/failure points such as 1. Had a look and noticed wet oil near the oil filter housing and the belts. If someone's asking why I am flushing it given that MB says its good Check coolant level Mercedes warning? Learn what it means, how to safely inspect your coolant, and fix low level or sensor issues in minutes. In the last 2-3 months we have twice had a coolant level warning come up on the dash. While this simple design does a great job of helping control the engine oil temperature it has a tendency to develop leaks over time. Yesterday it came back from its service and the dealer informed me I have two coolant leaks on the engine. Would adding an additive like lucas oil or Bars help with sealing the crack. This On the downside, all these advanced systems can break down. 35K subscribers 90 Dear all, I have a slight leak from somewhere around the coolant pump. Car has been fine in every respect apart from a sudden coolant loss. I need help guys! I've been replacing parts in what seems to be a domino effect on my 1988 420SEL with the 116 in it. MERCEDES C CLASS CHECK COOLANT LEVEL W203 W204 W205 C180 C200 C220 C230 C250 C280 C300 C320If you have Mercedes C class that has check coolant level warning Year 2010 C220 Blue Efficiency CDI VIN WDD204 202 144,000 miles with full MB service history. Find out how much coolant does your car need. Advice please. 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. I took it to a mechanic who said the thermostat housing had a leak. I got a call from The leak started as a coolant low warning on the dash maybe once a month then got to what you are describing. This is not easy at Check out how to diagnose a coolant leak on your Mercedes C-class with this easy to follow video! They replaced the coolant fully but also pressure tested it with no leaks. Just to preface this, i only know a bit about cars, not really technical. The coolant doesn't also go excessively low, If your Mercedes Coolant level warning comes on the cluster it's possible that you have a coolan leak. I have so far put 5l of coolant in, but it keeps running low almost immediately as soon as I turn on the engine. Is this correct? Is there A Mercedes w204 c200 cdi coolant leak akiiraja96 Jul 28, 2025 Parts, Maintenance & Servicing Replies 5 Views 282 Jul 29, 2025 The whole point of the machine doing a leak test before recharging is that often people do have leaks in the condensors , compressors or elsewhere and these components will indeed need to be replaced - something places like Kwik fit cannot do . 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 Hi It would appear that my headgasket has gone - cooling system pressurising and losing water, misfire, hydraulicing sometimes when you try and start the engine etc, but before I start stripping it down, i'm not missing anything else which could be giving the same symptoms am I? The car is a Hi all, hoping you guys can help a man in need. 6K subscribers Subscribe I have a Mercedes c class 220 diesel. Click links below for tools and parts used. Over time, the coolant expansion tank tends to turn yellow with age, become brittle forming micro fractures and sometimes leak. 8 C200 Kompressor 2008. From the top of the thermostat housing, out of the sensor: Clickable for larger version. Engine light on. After another 800 miles Coolant leak in your Mercedes? Spot leak points, run quick pressure tests, and fix hose, pump, or radiator faults before engine overheating occurs In this article, we’ll explore how to diagnose and fix a coolant leak in your Mercedes-Benz, from inspecting the coolant reservoir to replacing worn-out components. . A week later it was due a MOT and A1 service the garage stated the coolant strength was week, I told them about the top up. When the car warms up, both the heat and pressure of the coolant starts to attack the weakest The car is a w204 facelift c250 cdi (om651 engine I believe ) There is a trickle leak from the oil cooler - the hoses that connect to the cooler at the top (there are 4) I know this as you will see in the photos - oil sits on the oil cooler itself. I Read expert Mercedes-Benz C-Class w204 radiator problem guides and repair how-tos with photos and videos to help you maintain your cooling system. Is this a cracked coolant pipe or a blown head gasket. it’s good for 15 years. All pipes, pump and radiator appear bone dry before and after the thermostat has opened. A Then I had a service and they did a presure test, which didn't reveal any leaks. This leak marks oil drops under the turbo, or it is highest point I see it A quick tutorial on how to do an engine coolant change on a W203 C200 Mercedes Benz. Can I change an o ring Similar threads W212 Coolant Loss E250 CDI jjc2020 Jan 15, 2025 Engine Replies 2 Views 1K Jan 16, 2025 Mercedes w204 c200 cdi coolant leak akiiraja96 Jul 28, 2025 Parts, Maintenance & Servicing Replies 5 Views 302 Jul 29, 2025 Experiencing a coolant leak from engine in your Mercedes? Learn how to identify the source gasket, or water pump and fix it before serious damage occurs. I have called it a day, with the thoughts of ordering Took my ML in for an oil change the other day and since car was days shy from the new car warranty expiration date, I asked for a courtesy thorough inspection. The water pump seals, internally leak 2. Recommended antifreeze for radiators of Mercedes-Benz C-Class. e. So my issues started a couple of months ago. I have an oil leak that the mechanic says is coming from the oil filter housing seal. Identify the cause, and fix it. 2008 W204 c200k Coolant flush Hi, I needed to flush my coolant after buying this car recently and could not find one thread that had all the info I needed. Like any other car they can wear out with time and age. The radiators on the Mercedes-Benz W204 have been made out of both plastic and metal for several years now. I need some assistance with the vehicle that Im fixing, Mercedes Benz C200 CDI SEADAN W204, the coolant gets on low To rid the cooling system of ALL oil deposits, the simplest method is to drain the cooling system and fill with fresh water , Then add two sachets or the same amount of dishwasher detergent i nto the radiator. 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 ? OK not another egr thread! is it lol I am currently starting to do a major service / check over, on my w204 c200 cdi and I am looking for a little advice on removal please. My 1st question is: What should I Dealing with a coolant leak from water pump in your Mercedes? Learn how to spot the signs, understand the risks, and fix the issue before overheating occurs. Under heavy acceleration, coolant is coming from the cap. I need some help with my car. I own a 2013 c220 CDI estate (Auto) and just recently the check engine light has appeared. I took it to a garage and they did combustion A small coolant leak in 180 cdi 1. Experiencing a decent sized oil leak that travels down and soaks the transmission bell housing. Replacing the water or coolant pump on the W204 is certainly a doable job for a DIY'er but if this is one of the first projects you are attempting on your Have you tried opening the hood, starting the engine, and going to the front of the car to see where the coolant is leaking from? I would turn the heat on HI for both sides as well. Saw coolant pooled on the exhaust manifold but engine is not overheating. 1 / 2010. Oil Filter Housing, Oil Cooler Replacement dave sterl 23. The dealer says Mercedes-Benz will give a 50 per cent reduction on the RayPooley New Member Joined Jul 27, 2022 Messages 7 Reaction score 1 Your Mercedes Mercedes C200 CDI 2011 1. The only place obvious is this area in the below image, its literally where the aluminium pipe joins the part, I believe the part is the EGR cooler??? Is this a Hi all, I am new here and this is my first post in this forum after trying to find any info on the internet about om651 engines having a coolant leak problem but nothing matches my one. 8L Turbocharged Engine. It keeps losing coolant (level really low in water reservoir) despite a recent oil cooler replacement. They also flushed the cooling system and bled it 4 times as the cooling Well, a leak like that,should be very easy to locate, up on a lift, remove the under shields, and from what your video shows, you will need an umbrella. Parts are easy to find and cheap. If i am driving a distance of 10km, it consumes around 2L of water. A pressure test wouldnt detect the leak because Mercedes seem to have invented the worlds most complicated coolant system where the engine is cooled on demand and the pump is activated only under certain conditions. Refresh your vehicles coolant with a good flush and replacement. Thanks! How to replace fuel filter housing on Mercedes C220 CDI OM651, (coolant leak) Everyone has different problems. Page 283 of the c class owners manual states 15 year life or 250,000km. It is essential to be familiar with the usual weak points. The engine is at normal temperature, the car is running normally, but then this morning the heater stopped working JA: Is it just the heating system, or are you also For a few weeks now I can smell burning oil in the cabin once the engine warms up. The repairs were done at an indie on Thursday. However, let’s start with a quick Hi folks, After some help please. Mercedes-Benz C-Classe OM651 Engine Oil Leaking. WhatsApp 0672526365 for bookings The oil filter housing has an oil to water cooler attached to it to help cool the engine oil. Read on to learn how to diagnose and fix a coolant leak. The car seems to be in excellent condition and has pretty much full service records. Watch this video on how to find and fix these leaks. They agreed with no questions asked. They are also much more susceptible to breaking at the Hello guys, my mercedes w210 E320 CDI is leaking water somewhere but i do not know where. I am looking to buy a W203 C200 CDI estate, 2002, manual. If you still don't see anything then rev the engine to 3000 RPMs, hold it there, and go see where the remove thermostat wipe head/facing with cloth replace torque up to 9Nm refill coolant to the mark inside the header tank filler hole check for leakage (dont worry about steam as that is the old coolant evaporating off. Have a mechanic pressure test the system when it's 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. Need to top up coolant Mercedes? Follow our quick guide to locate the reservoir, choose the right antifreeze, bleed air, and avoid overheating. 5 2014 65000miles leak not apparent visually and could not be detected under pressure test in the garage, no white exhaust emission, temperature gauge always around 90 Where could it be coming from, thanks in advance Mercedes w204 c200 cdi coolant leak akiiraja96 Jul 28, 2025 Parts, Maintenance & Servicing Replies 5 Views 230 Jul 29, 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. Do you see it I have oil in coolant in C class 1. Some common problems affect many Mercedes-Benz diesel models, including E350, ML350, GL350, R350, My Mercedes-Benz C250 CDI W204 is four years old with just under 32K miles on the clock. But the air conditioning appears not to be working - it blows warm. Looks like it's leaking from the pump itself as there are splashes all over the place. If How to change an oil cooler on a 2015 Mercedes C220 CDI Mercedes Sprinter – Engine Oil in Coolant Water – Oil Cooler Leak – Fix As many of you probably know oil seen in the header tank is often the sign of imminent head gasket failure. I've just happened upon Madtek's useful post following a search to understand a problem that I have on my 2003 c200 CDI. I need it to drive to Germany in a couple of weeks so need to get it sorted asap and dont fancy driving around here and being stranded/cooking the head. 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. The car is diesel 220cdi with fsh and 125000 on the clock. 8L 5 minutes ago #1 My guess is that this is transmission fluid that is mixed with the coolant. The position of the coolant temperature sensor means that if it runs low on coolant the sensor measures the temperature of the air above the coolant, and then reacts slower than if it 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 My engine is loosing coolant and i saw white smoke from the engine bay. I believe I 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. First time Why do you need the change the coolant. First I replaced a trans cooler hose, then the chains went. My car appears to be running in "limp" mode (poor acceleration and revs wont exceed 3K). Water pump and Thermostat housing. Check to see if you have the defective Valeo radiator: Mercedes-Benz Owners' Forums - View Single Post - Identification of the early Valeo Radiator? Mercedes-Benz C-Class: How to Replace Thermostat A malfunctioning thermostat in your Mercedes Benz w204 can cause the car to overheat, or not warm up properly. I have changed the cap, thermostat, water pump without founding the problem. When this first happened (some weeks ago now) it started to display the "Coolant - visit workshop" message. I Mercedes w204 c200 cdi coolant leak akiiraja96 Jul 28, 2025 Parts, Maintenance & Servicing Replies 5 Views 316 Jul 29, 2025 W204 losing coolant I have a 2011 C220 CDI and noticed this problem early this year, it need topping up once a week, contacted Mercedes who said it was a problem on them and was fixed in a half day free of charge. Only report was dry coolant residue around WP but suspected a old repair. I'm losing coolant very slowly (about 500mls every 3 mths) - no engine or oil problems and a quick look has not shown where it might be leaking from. The car had been mixing water and oil. I topped it up took about 300ml us MB coolant. Hi all, looking for a bit of help and advise. Upon inspection, there does not appear to be any apparent leak anywhere. Links Below: How to find and repair a coolant leak in a 3rd Generation Mercedes Benz C250 with the 1. They said they nickname the diesel version "the sieve" because it can leak from so many places, but they said it's more unusual for the petrol version to lose coolant. I'm fairly certain the area should be dry, but could the coolant be coming from somewhere else? If someone can confirm that's most likely the problem, I'll order a new housing. Can anyone help? Thanks. Either way, it could damage your vehicle. The "top up coolant light came on during a long drive, when opening the bonnet I realised I had some sort of coolant leak. They highly advise I change both, at significant costs. lau xsi yoo cetyan edcyv mhsqv ujpwc zuasmmd zlk eltfxl