Question about GMC Yukon Denali

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I have a 07 Yukon Denali. The AC works fine in the front and rear but for some reason when you turn on the rear climate system nothing blows out of the rear top vents just the bottom ones. Other then this everything works fine. Why is no air blowing out of the top vents but will out of the bottom?

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Do you own a set of pressure gauges for R-134a? If not, you can't do much except make sure there is air flow out of rear unit. My guess is there is low refrigerant in system. You can't tell unless you evacuate it and see how much comes out. The new machines will pull it out and weigh it.

The only other explanation I can imagine is that he actuator won't move fully into the proper position and the fact that the air speed is lower on 1, it doesn't generate enough air pressure to pass the actuator.

Tell us news.

Posted on Aug 05, 2010

  • barton22 Aug 05, 2010

    I do not own the pressure guage. There is air flow out of the rear unit but it just out of the bottom vents and not the top. You can control the air speed just fine and temp in the rear but it just comes out of the bottom vent. Everything worked fine one minute and was doing this the next, just out of nowhere. Is there anything that can be done to try and diagnose the problem before giving it to the dealer for 2 days and $500? Any help or recommendations are appreciated. Thanks!

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