2004 Pontiac Grand Prix A/C

NOT A CAR EXPERT

MEMBER
2004 PONTIAC GRAND PRIX
AUTOMATIC
150,000 MILES

My freon has good pressure on both high and low side. Fuses are good. Clutch is engaging I can hear the ac kick on and my rpm drop a little. But the air coming out is as hot as it is on full high heat. Could my temp knob not be working some how maybe?

4 Replies

JACOBANDNICKOLAS

MECHANIC
108,133 POSTS

It sounds like the blend air door is stuck in the heat position. Have you checked it?

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Thursday, June 5th, 2014 AT 12:04 PM

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How would I check it. Where would it be at

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Thursday, June 5th, 2014 AT 4:32 PM

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Is there any test you can come up with. I've pulled the hvac fuse and let it reset with no luck. Just tried to clamp both heater core hoses. Still is hot. Maybe I didn't get a good enough clamp. My consol for ac has other buttons like defrost and seat warmer. And the buttons on them are messed up and hard to turn things on and some buttons don't work at all like defrost so I was thinking maybe the temp knob is broke?

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Thursday, June 5th, 2014 AT 6:30 PM

JACOBANDNICKOLAS

MECHANIC
108,133 POSTS

The blend air door is located near the heater core (under the dash). The door is to open one way to allow heat to enter the vehicle and the other way for AC. You need to see if it functions.

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Thursday, June 5th, 2014 AT 6:31 PM