Question about 2003 Ford Explorer

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I have a 2003 Ford Explorer that is overheating. I have replaced the thermostat, replaced the water pump. The odd thing is that the temp gauge "bounces" between the mid level and the red block. It moves like a tachometer does. There is water in the res, and no leaking of coolant. It was driven over 1000 miles without a problem, but once we reached the city and start and stopped, the temp gauge went crazy. Suggestions?

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Did you burp the system? these engines have a problem getting all the air out of the system. Look for a bleed valve near the thermostat and crack it openwhen the engine is cold. I believe they also had a problem with the head gasket on that year if it over heated. good luck be sue to get the air out of the heater and the radiator they can be a problem.

Posted on Sep 07, 2010


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i wonder if possibly a defective thermostat, that it is sticking open.
to bench test thermostat place in a pot,if you have a candy thermometer all the better ,place in cool water and bring to boil checking should open alittle at a time until being fully open at what ever temp it is rated at
then slowly add cold water and it should close in a similar fashion

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