© Bad water pump: The water pump is responsible for keeping the coolant cycling throughout the engine. As soon as you can safely pull over, do so, and then book one of our mechanics to perform an inspection. It is quite difficult to get out and may require special tools. The fan clutch uses a bi-metallic spring that tightens when the temperature increases. If the gauge varies noticeably then either the thermostat is defective or the sensor is defective. 2008 Mercedes-Benz C300 Engine Coolant Temperature Sensor: C300 4Matic Luxury - 3.0L 6 Cyl (24 Valve) on Radiator Also Use- (Qty) (1) 009 989 09 71 10 Coolant Sensor Adhesive. The thermostat may also stick open. After the coolant transfers its heat energy to the air, the water pump recirculates it around the engine so that it can absorb more heat. Not sure how much more money I am willing to spend to resolve the issue but the next step would be to replace the radiator and replace the temp sensor. When the fan shroud breaks or becomes dislodged, air fails to enter the radiator, and the coolant will no longer have a place to direct the transfer of heat. I like to do this before I work on any electrical component on the car. If you are replacing your thermostat it may be a good idea to swap out the sensor while you have it off as it is much easier to do then and the sensor is not very expensive.Begin by disconnecting the ground strap from the battery. This is a prevalent fault on Mercedes-Benz W204, W207, and W212 models. What seems to cause this problem? Mercedes-Benz Owners (MBO) Forum, exists for the benefit of owners of Mercedes-Benz cars. Step by step: How to diagnose low coolant level messages; fix and get rid of these error messages. A stuck thermometer may stay permanently sealed and therefore keep the coolant from reaching the engine block. not fluctuating as much anymore) but the engine constantly runs at 95 instead of 90 (with minor fluctuations down and up between 95 and 85) now and the top up coolant warning appears randomly every now and then. He was very professional and great to work with! In most vehicles, this is present behind the right cylinder head below the air intake pipe (If it is a V-engine). I have replaced the termostat, water pump but nothing. According to epc, the current part number for the coolant temperature sensor is as follows; A0009056102 (please contact local Mercedes dealer to check for supercessions in our systems). W202 C-Class '95 C180 Coolant Sensor Erratic. Temperature coolant gauge dropping in W204, CGI - Blue efficiency 2010 Model. Discussion in 'Electrics, Vacuum, Ignition and ECU' started by PaulMdx, Sep 22, 2010. Broken radiator fan shroud: The radiator fan shroud directs the airflow across the radiator so the air can absorb the coolant’s heat. A proper ratio of antifreeze to water is 50/50 to 60/40, depending on the vehicle. I really appreciate Andrew for this expertise because I logged call for some other issues eventually those were incorrect when Andrew review he guided me in right direction to fix my issue. It seems like the temp sensor is adding the actual water temp to an erroneous electrical water temp. Without coolant, the engine would quickly ruin itself with its own heat production. Broken or missing air dam: Along with the shroud, some vehicles have an air dam (or deflector) underneath the vehicle. The Mercedes-Benz Owners is a completely independent organisation. 2010 C200 CGI /W203/SLK230/W202/230E/280SE. The temperature warning light is on the dashboard gauge cluster and usually contains the words “temp” or “engine overheating.” Or, it may simply show a picture of a thermometer. Service Location. Hi, There are seaparate lights for the washers and coolant tank but if either level switch goes U/S it can put the others light on. document.write(new Date().getFullYear()) Typically, this is a 'no code fault,' meaning that the check engine light isn't illuminated and there are no codes stored in the ECU. When the engine first turns on, and it is still cold, the thermostat keeps the coolant from circulating, which allows the engine to warm up as quickly as possible. I have the same problem too on my 2013 C250. Most vehicles also have an engine temperature gauge that shows just how hot the engine is. This website is not in any way connected or affiliated with the Daimler Group. Just had it in a Benz shop for b service and they didn't say that anything was wrong. Even on long freeway trips I have seen it fluctuate up and down at steady state cruising speeds. If this is broken or missing then the air can pass underneath the vehicle but not also through the radiator, which will cause overheating. As soon as you notice the light come on, pull over. With the exception of older, air-cooled vehicles, cars rely on a liquid called coolant (or antifreeze) to keep the engine at an optimal temperature. It took me a while to replace the sensor and had cuts and bruises as a result. On these models, this is often the result of a faulty A/C pressure switch reporting an implausible value or an excessively high value. Made with ♥ in Silicon Valley. I still have warranty on the car that's why I want to know if there is something wrong. I admire his work, I would highly recommend Andrew to anyone. owners like you. 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