I have a 2002 Jeep Grand Cherokee. The check engine light is not on. However the car begins overheating when sitting at idle. The radiator fan does not run at any point. Could a bad thermostat cause the radiator fan to not run?

Why is my car overheating at idle or in heavy traffic?

oldtimer-11 August 31, 2010, 2:52am 6

You probably have a bad fan relay or a bad fan control module. Does the fan(s) kick on when you put on the a/c.