3-Series (E36)Chat relating to the BMW 3-Series from 1992-1999. Autodoodad
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Car overheated while idling. Thermostat was completely in pieces when the housing was removed. Replaced thermostat and discovered leak in radiator. Replaced radiator and cap. Vented system and let it run. Heater got hot and fan would kick on. shut off and let it cool down. Went back and it didn't want to start. When it did it idled fine but overheated and vented out new cap.
Did you make sure you bled the system? Not bleeding it properly will leave air in the system which will cause it to overheat. Did you check your clutch fan? If its not working properly you will overheat while idling. It's quite common, including happening to me once.
Have you check water pump is working?? Start car cold with filler cap removed, you should be able to see the water pumping through top of expansion tank. If not impeller on pump may not be working. Had exactly same problem, changed thermostat and rad and then pump all ok now. Good luck
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