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My 1999 Grand Prix 3.1 temp gauge was jumping up and down changed 3 wire piece that screws in by thermostat, changed thermostat, changed water pump. The radiator fans do not come on until the temp is near the red. When driving temp is good when stopped temp creeps up to near red fans kick on and repeats.
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Don't think so... I had one 2004 prix that lost it's coolant and it ran until it destroyed itself... Had another that would hit red on temp during the summer in the desert mountains. Never shut down on me though.... replaced the radiator, water pump and thermostat. My fans kick on about 3/4 of the temp gauge. Normal temp is between 1/2 & 3/4.
I'm assuming that you mean that the temp gauge is reading "High" and then dropping back to normal(?).
Check your coolant levels first. If there's plenty of juice in the coolant reservoir then I would just jump in and change the thermostat. While you're at it check your hoses too!
does the upper and lower hoses seem to be the same temp when car begins to overheat? ore the radiator cooling fans coming on before the car overheats? did you pressure test the cooling system and radiator cap? also may want to remove the lower hose and flush the radiator. is the check engine light on and does it run bad?
its either of the 3 ur water pump is weak and couldnt supply the right amount of coolant to ur engine / ur radiator is clogged or your thermostatic valve is stuck up that restrict full flow of fluid to the radiator thats why when u use the heater that uses ur coolant hot water as a heating unit the temp. goes down...
have you been adding coolant ? if the level is low you can experience this problem , or it could be a thermostat thats getting to the end of it's life !
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