![]() ![]() Add coolant to the radiator expansion tank.If you have a torque wrench, you can tighten these two bolts to approximately 10Nm. Tighten the two bolts and reconnect the radiator hose.The old gasket should be removed and discarded. Ensure that you have a new gasket for your thermostat. Install the new thermostat in reverse order.If the thermostat doesn’t come loose, you may need to pry it away using a flat screwdriver. Remove the thermostat from the engine block. The sensor is typically found in 2008,2009,2010 and newer models such as C300 and E350. Unplug the electrical connector from the sensor if your car has one. Use the E-Torx socket to remove the two thermostat bolts.If you decide to not remove the coolant note that there will be coolant spilling from the radiator hose and thermostat when you remove the thermostat from the housing. At the bottom of the radiator of your Mercedes-Benz, there should be a drain plug. To replace the thermostat, you will need to drain some coolant from the radiator. Mercedes Engine Thermostat + Aluminium Housing + Seal Gasket How to replace the thermostat Tools you will need:įEMALE E-TORX (Star) SOCKET Set w/RAIL E4 – E20 Make sure that the engine is cold before you start replacing the thermostat on your Mercedes-Benz. Once you confirm that your thermostat has failed, follow the instructions below to learn how to replace it. This article shows you how to use an OBD II scanner to read the check engine / ECU fault code. In most cases, you will get a P0128 – Coolant temperature below the thermostat regulating temperature fault code. You can verify this by reading the ECU fault codes. In this case, the Check Engine Light may come on. When it fails in the open position your Mercedes-Benz engine will take a long time to reach the normal operating temperature.When it fails in the closed position, it can cause your engine to overheat.I ordered a Wahler thermostat, but it arrived in a BorgWarner box.The thermostat can fail in open or closed positions. I wanted an OEM thermostat and I found posts suggesting that Wahler was the OEM manufacturer. However, watching both videos prepares you for any glitches you may encounter. It misstates the model years for the M271 engine (at least for U.S models) and they identified a broken thermostat housing is a spacer. There are at least two good YouTube videos showing the process for replacing the thermostat on the M271 engine. I know my car usually ran with the needle right on the 80 degree C mark on the gauge. Some sources suggest that the cars were originally equipped with 85 degree Centigrade thermostats (or possible 87 degree C), but the current part is a 90 degree C unit. I also learned that Mercedes may have changed the specification on the thermostat after they manufactured the car. I saw some information that suggested the two codes were related because the system may be attempting to adapt for the low operating temperature by increasing the fuel to air ratio. One of the CEL's had two codes - in addition to P0128 I also had code P0172 which means that the system is running too rich. The C230 had plenty of heat when the CEL illuminated, so I would not have known about the problem without the CEL. Each time the thermostat was stuck fully open and I became aware of the problem because I had little or no heat in the passenger compartment. This happened a few times when the weather was below freezing. A quick search showed this code means that the engine's control module detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The reason I changed the thermostat is that I had a CEL and the code was P0128. I replaced my thermostat yesterday, and I am sharing the information I gathered that made this process go smoothly in the hope this will benefit someone else. ![]()
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