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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I just don't get why that doesn't work right in the first place. ... I have 99 Yukon that has a problem with the front air. .... $55,000 for my GMC, I guess expecting cold air when we push A/C and getting 90 degree blast ... 2001 Yukon XL 1500 Front heat & air fine, rear ac blows hot as if heater is on in all settings. More results from forums.edmunds.com

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If the rear is working well and front is not I would suspect a blend door or actuator issue in the front.Double check and see if you can hear anything moving when you are adjusting temperature from hot to cold.Also check and make sure the air flow moves properly from defrost to vents and floor etc.

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HEAT IN MY 2003 chevrolet tahoe WORK IN THE FRONT BUT in the back it says cold. it blows great just does not get hot....


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If you still get cold air out of the rear vents but the front only blows hot air you may have a bad temp door actuator in the dash, it may be stuck on hot and not able to move to cold air. However if you are low on freon with a truck that has front and rear ac then there will be a temp diff between the two. If it is hot air out the front like the heat is on then you have that actuator problem but if it is cool air about the same as the outside air temp then you may be low on freon.

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you may just be low on freon. The rear will often work ok when low, but the front won't

The same compressor serves both front and rear systems. Check that first.

ALso, check to see if your front blend door rotates when you raise & lower the temperature.

report back on results

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