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2000 GMC sierra AC only blows on high settings

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Replace resistor. that is the module to the left of motor

Posted on Sep 01, 2009

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My gmc yukon 2000 slt rear ac blows hot air when i have ac . on and the front works fine .


I have a 2000 GMC Savana Van SLT with front and rear AC/Heat. My front would blow hot while the rear blew cold with AC on. It turned out to be low on Freon. It's hard to know if you have the right amount of freon installed because pressures vary depending on the ambient temperatures. So the best way is to remove all the freon then reinstall the recommended amount as listed on the evaporator housing near the firewall. This worked fine for me... works like new after installing the correct amount of freon.

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You would need to find out if the compressor continues to run when the cold air stops.

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Usually a sign you have a blend door that is stuck, or the controller has failed. The blend doors use small electric motors controlled by the main controller on the dash.

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Jun 11, 2011 | 2003 GMC Sierra

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It sounds like you have a fan clutch problem. You can test this by letting the truck idle, place a fan in front of the radiator, on high and see if it cools better. Good luck.

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1 Answer

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you need the tempature blend door motor. My 01 silverado had this issue about 1 1/2 years before i was tired of messing with it they are not hard to replace. The cover (if it is still on) for passenger side floor ducts needs to be removed and the motor is near the right side of "hump" (trans tunnel) mounted horisontial with the armature pointing upwards.

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1 Answer

2004 gmc sierra 5.3. AC not working AC Compressor fuse blowing


UNPLUG THE A/C CONNETOR ON THE A/C COMMPRESOR. REPLACE THE FUSE AND TURN ON THE SWITCH. FUSE OK . REPLACE THE COMMPRESSOR AND THE RECIVER DRIER.

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