Question about 2003 Chevrolet Suburban 1500
I suspect if you have most bells and whistles your Yukon has automatic temperature controls.
I went through the diagrams and service bulletins. Nothing in bulletins relating to your issue.
These systems are complicated. They are operated both by computer data and analog systems, and as you are aware, from two different control panels.
The wiring diagrams for the heating/ac system is 8 pages.
If you have not yet done so, check fuses related to heating and AC.
There may be codes stored in the body control computer that will help pinpoint the problem.
It may be as simple as a jammed heat door or a bad motor that operates it.
I could make guesses for hours but ultimately you may need to bite the bullet on this repair and take it to a qualified HVAC technician.
I wish I had a better answer for you. Keep trying to find a tech here if you like.
There is my opinion Randal, thank you for listening and using FixYa.
Posted on Dec 31, 2010
a 6ya expert can help you resolve that issue over the phone in a minute or two.
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Posted on Jan 02, 2017
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