Since the problem occurs when not moving and the engine cools when the fans finally turn on, the thermostat isn't the problem but rather the fans not turning on. My guess is if you are driving at highway speeds, the engine runs at a normal temp. Is that correct? If so, the problem could be a couple of things. I would first start by switching the fan relay with another relay in the relay box that has the same part number. See if the fans turn on when they should then. If they do the same thing, then the next possible problem is the coolant temp sensor.
Try the relay first and let me know what you find. Again, since the car cools down when the fans turn on, the thermostat is NOT the problem.
Joe
PS: I assume the coolant is full.
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Tuesday, June 3rd, 2014 AT 5:51 PM
