I have a 1995 pontiac grand prix. The temperature gauge goes up during idle when i stop at stop signs or traffic lights, but then goes back down when i start driving. What can be the problem?
While driving my temperature gauge stays in the middle or just barely above the middle line, but when i stop at a stop sign or traffic light, it starts to go up into the red and then come down when i start driving again.
Check your cooling fan operation. When you're moving, you have more air flowing across radiator, helping it cool. Your engine is also revving higher, so the water pump can move more coolant through engine. If it's getting hotter sitting still, then the cooling fan may not be working, or the water pump may be worn. It's also possible you have a partially blocked radiator, they do gunk up on the inside leaving too few water passages to do the job. So look at those 3 things: cooling fan(s), water pump, and radiator. Wouldn't hurt to go through entire cooling system and make sure it is up to snuff, given the vehicles age.
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