I replaced the water pump in my 1988 190e one week ago. I noticed something strange with the fan. Before I replaced the water pump the fan would turn very slowly everytime I saw it running (I have only had the car 2 weeks). I assume it kicked on when the temp went up. After the water pump was replaced the fan now turns all the time at a
not fast but not slow speed. I never see it stop. My question is this. I just noticed today that if I sit in the car with it running for about 15-20 min. the temp gauge starts going up. Once the temp gauge gets to about 100 the big electric fan on the front of the car kicks on and it starts cooling off. Is this normal? The temp outside was only 60 when this happened.It only happens when the car is sitting still. The temp is fine during normal city or highway driving. Did I put the fan on wrong. Please help!!!

On a 190e, both fans are electric and are controlled by a thermo sensitive switch. The fan connected to the front of the engine should free wheel when the engine is off. NEVER try to stop the fan with the engine running, for if it turns on it will take fingers with it. The other fan on the front of the a/c condenser core is the aux. fan. It will run while on occasion while the a/c is on and/or when the engine coolant temp is above aprox. 105 c. If the bolt and washer that fastens the main fan onto the enine were not installed properly, the fan will turn all the time because it is not allowed to free wheel on the bearing it rides on.