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Old 08-16-2022, 02:20 PM   #1
chadthebad
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2005 VUE 2.2L
Default Opposite AC Problem than usual

My 2005 VUE has the opposite problem from every AC I've ever had... It blows cold at idle but warm air as I drive. I just got it back from a mechanic that replaced my blower motor resistor, and it still doesn't work. He obviously didn't even test it. I'm not going to take it back to him, however does anyone else have any idea what this could be? It's been a long hot summer.

Edit: I have the 2.2L V4 engine
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Old 08-16-2022, 04:43 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: Opposite AC Problem than usual

Did the blower run whether or not ac was cold or hot? The blower motor moves air thru the hvac box (hot, cold or mixed). The ac system, when running, produces cold air for the blower motor to force air movement thru the hvac box.
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Old 08-16-2022, 10:25 PM   #3
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2005 VUE 3.5L
Default Re: Opposite AC Problem than usual

Sounds like a hole somewhere letting warm outside air to be forced in while driving
...
2005 Saturn Vue
Front Wheel Drive
3.5L V6 Engine
5AT Automatic Transmission
180,000+ miles
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Old 08-17-2022, 10:16 PM   #4
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2003 VUE 3.0L
Default Re: Opposite AC Problem than usual

When stopped, you feel change in vent air volume switching from low speed to hi?
I’d set fan to 2 or 3 at stop. It’s cold. Then accelerate to 20-30-50 and feel for cold air. At some point the air temp starts to get warm?
So, fan speed is ok but compressor is staying off? Or, your evap is cold but blend door is flaky.
The heater core is always hot. The hvac cold-hot dial controls air blend mix
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Old 09-09-2022, 04:24 PM   #5
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2005 VUE 2.2L
Default Re: Opposite AC Problem than usual

ok - it's fixed, however I don't know what sensor it was. Took it to a buddy and he pointed at a sensor in white and blue housing under the hood up near the dash. it had one of the wires cut. we fixed that and the ac runs fine now.

Thanks for your help everyone.
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