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Turn on the heater the temperature starts to go up?

Tiny
BIGLU
  • MEMBER
  • 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.
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Tuesday, March 6th, 2012 AT 2:16 PM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 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
  • 2 POSTS
How can I check the radiator?
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Tuesday, March 6th, 2012 AT 10:44 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 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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