TURN ON THE HEATER THE TEMPERATURE STARTS TO GO UP?

  • Tiny
  • biglu
  • 2000 Pontiac Grand Prix
  • 160,000 miles

I have changed the thermostat and heating sensor on my 2000 3.1 gran prix. Both hoses are hot when I have the car running. I turn on the AC and the fan comes on, but when I turn on the heater the temperature starts to go up.

changed thermostat, heating sensor and replaced the antifreeze. AC works but when I turn on the heater it starts to overheat. AC fan turns on and both hoses are hot.

Tuesday, March 6th, 2012 AT 2:16 PM

3 Answers

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

The radiator may be clogged.
Did it overheat prior to this repair? If it did, get a leak down test to verify the head gaskets are ok.

Roy

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Tuesday, March 6th, 2012 AT 3:29 PM
  • Tiny
  • biglu
  • Member

How can I check the radiator?

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Tuesday, March 6th, 2012 AT 10:44 PM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

You can do a temp check from one side to the other but I reccomend you take it to a radiator shop and they will remove it and acid flush it out.

Roy

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Tuesday, March 6th, 2012 AT 11:24 PM

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