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I have a 99 Yukon 4x4 all of a sudden the heat wasn’t working until I turned the headlights on and it redirected the vents from feet and defrost to vents and feet Why why haha if anyone has anything please let me know
My headlights are controlling everything air temp and direction it’s crazy was thinking maybe a wire is sharing a common ground or something but went to look and it seems the previous owner was a stereo guy and there are more random wires around then I was prepared for only saving grace is mostly capped off or taped
That sucks. Yeah, it has to be something crossed in there. It should be relatively easy to trace it from the a/c panel. Here's a diagram from a 1998, maybe it will help sort through the wires...
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