Question about 1999 GMC Yukon

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Yukon A/C, rear blows cold, front ducts a LOT warmer.

I am confused. I have a 99 yukon with front and rear air. I assume that
they are off the same compressor. The front dash barely puts out cold
air when outside is in the 70s. However when outside is 80's / 90's the
dash blows cool to warm air. The rear unit blows cold air no matter
how hot it is. I checked low pressure side and it shows to be a good
pressure. Are they separate systems or is there something strange
that cause a temperature difference like this?

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  • Anonymous Mar 15, 2014

    2006 yukon xl blows cold air in rear when it should be hot

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There is only one A/C system split into 2 zones. Check the blend door actuator, it may have failed in one position or something may be jamming it. Also check the control panel in the dash, My 98 yukon did the same thing, no matter what temp you selected for the front it would blow at about 70 degrees. There is a circuit board in the control panel that gets corroded and one of the circuits controls blend door operations. Have a look.

Posted on Jun 12, 2008

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