Mechanics

I HAVE CHANGED THE THERMOSTAT AND HEATING SENSOR ON MY 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.

2000 Pontiac Grand Prix • 160,000 miles

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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Biglu
March 6, 2012.




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

How can I check the radiator?
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Tiny
Biglu
Mar 6, 2012.
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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