It might be a sensor or wiring issue if the fan isn't coming on. Your water pump may be seized or there could be another obstruction in the cooling system.
Does the car have any other symptoms or problems? How long does it take to overheat (driving or idling) and how warm is the area in which you live? Do you have the proper coolant in a 50/50 mix with distilled water?
Saturday, April 5th, 2008 AT 6:40 AM