What is your question?
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What is your question?
To get hot air for front i must turn temp to 90*. If i turn down to 89* or below i get full cold. It does same for either side in front, but independently. Rear works normally.
How long has your 2005 GMC Yukon had this problem?
a few months
The way I see it IF problem within is the HVAC unit itself - it wouldn’t be same for each zone.. Hard to imagine the same failure is present for the internal mechanical baffling that is also responsible for temperature control - dual zone.. But then again that’s only an online theory.. of course.