I recently replaced the radiator (cracked), thermostat (stuck), and aux fuse (blown) due to overheating problem. This fixed it I thought, but today temp creeped up and aux fans never came on. Later they worked fine, but them stopped working again. The fuse is ok this time.

Does anyone know what all is in the circuit that controls the fans? My manual doesn't show the fans in the wiring diagram for some reason. Is there a resistor and/or a relay? I assume there are 2 sensors and I think that I can find these but I don't know what else.

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Ken Fuller
1990 300E