Radiator fan is supposed to start working after the temp reaches a certain limit. And it is supposed to run til the temp reaches a certain lower limit. So when you switch off the engine and walk off the fans must be running to cool the water to that lower limit. Unless you seen that it runs well past that and does not stop at all. Does it start running when you start the engine? And runs throughout the time the car is running, which it should not. The relay seems to be out. It is this relay that controls the running of the fan. or the temp gauge. If the temp gauge is giving wrong temp then the relay has to keep working. Please check both, the relay and before that the temp gauge.
Raoiatpr
This could be either... thermo sender unit failure, fan relay failure, low coolant level (check when cold) or overheating. Your engine may be running at a slightly higher temp than the thermo sensor is set for, have your engine digitally or lazer checked by a good mechanic or coolig system service, if the engine temp is ok, try installing a slightly lower value thermo sender unit.
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