have a 1998 pontiac sunfire,have changed water pump,overflow tank,thermostat,but temp gage drops to

  • Thread starter Thread starter rjtledo
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rjtledo

have a 1998 pontiac sunfire,have changed water pump,overflow tank,thermostat,but temp gage drops to

zero why? engine light stays on and occasionally car will start hesitating,i'm confused because i've never seen temp gauge drop when engine is hot
 
You need to make sure that you have gotten all of the air out of the cooling system. If there are air pockets left in the cooling sytem the gage will act erratic and cause hot spots to develop in the engine throwing off the computer.
Fill the radiator full and let the engine idle. Turn off the engine and let it cool down.Open the radiator cap and fill it again. Repeat process until all the air is out of the system.
 
Sounds like you have a problem with the wiring. Check the wiring harness. Better yet, check the computer codes.
 
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