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Started by Jan S, 10 June 2021, 05:36 PM
Quote from: revilla on 10 January 2022, 05:27 PMHi Jan,As suggested before, your temperature sensor is most likely at fault. They are available at MB or ebay or auto-doc in Europe, not expensive and easy to replace. By experience, cleaning them doesn't solve the problem. They loose their calibration with time/cycles. A new one will solve your "low" temp issue. Your old thermostat was probably working just fine, but the sensor was sending a wrong value to the gage. I had this happened to me 2 times in W116s. If you want to test sensor, you can remove it from engine, then re-connect its cable, then ground it through its body to the chassis, then put a heat source to the bulb, see what the gage does. Ignition in position 1, do not start the engine, coolant will spill all over your garage, unless you plug the empty slot. Probably a 2 people task.Good luck
Quote from: daantjie on 10 January 2022, 05:38 PMIndeed if we assume your gauge is reading low, then a 900 rpm idle is for sure too high for a fully warmed up engine. You can also use an IR temp gun to read the temp at the thermostat housing. Granted it will be lower than the actual water temp but it should give you an idea of what's going on. 87C at the hose is almost too hot to touch, depending on how tough you are of course
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