1998 Pontiac Grand Am cooling

1998 PONTIAC GRAND AM
120,000 MILES • 6 CYL • 2WD • AUTOMATIC
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CARFREAK8184
  • MEMBER
  • 16 POSTS
I first start the car up it and drive it until it reaches operating temperature it then goes approximately 20 degrees above normal and then goes back to normal and it doesn't happen again until I turn the car off, let it cool down, and drive it again. It always stops at the same spot and always goes back down to normal. Why is this?
It has a new radiator, thermostat, coolant, no head gasket leaks. Mechanic has insisted that the water pump is working fine.
Sep 26, 2010 at 1:15 PM
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BILLYMAC
  • CAR REPAIR CONTRIBUTOR
  • 2,204 POSTS
the guage is prob not accurate you need to have it hooked to a scanner when it does this and check the temp to be sure it is accurate. if so put in a new temp sensor the one for the fuel injection not the guage
Sep 28, 2010 at 8:18 PM
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