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I have a 2000 GMC Yukon. The air conditioner blows hot air in the front seat area, while blowing cold air to the back seats when the rear controls are turned on. Also, I opened up the bottom area, where the AC is routed through under the dash, and pulled out the 2 inner air filters. They were both very clogged. After doing this though, I still noticed that hot air was coming from the air around the exposed coils.

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I have a simular problem in a 2002 Tahoe. It turned out being and actuator that controls a flap door that separates the air flow from the heat box. When this part goes bad the control knobs are useless is what they control don't work. According to my Chevy Dealer this is a common part to go bad. This part is located in the rear or the truck behind the passenger side wheel well on the inside of the truck. In this area is a system simular to the system that is in the dash. There is a heater core back there and this is where your rear heat comes from. The same as the front system in your dash. When this actuator fails it will be in the open position on the flap door that goes to the heater box. This more than likely is your problem. I currently have a 2004 Sierra. I have a simular problem again. There is 4 actuator door in my separated climate control system. I can't tell you which one is bad but I can tell you that more than likely this is your problem. You will have to get under the dash and notice which actuators move with your switches and which one does not. It will be a little black box. Maybe 1/2 thick and 3 inch by 2 inch estimated with a little round white piece of plastic that fits the arm that goes to these flap doors that direct the air to wherever your switches are telling it to. Price range from 50 to 150 bucks at your local parts store. Good Luck.

Posted on Sep 16, 2010

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You may have a vacuum problem, see if the gate for the front air is opening

Posted on Aug 26, 2010

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