turn on the heater the temperature starts to go up?

2000 PONTIAC GRAND PRIX
160,000 MILES
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BIGLU
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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.
Mar 6, 2012 at 2:16 PM
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ASEMASTER6371
  • CAR REPAIR CONTRIBUTOR
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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
Mar 6, 2012 at 3:29 PM
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BIGLU
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How can I check the radiator?
Mar 6, 2012 at 10:44 PM
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ASEMASTER6371
  • CAR REPAIR CONTRIBUTOR
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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
Mar 6, 2012 at 11:24 PM