Quote:
Originally Posted by structures
I have a 03 Z71 with 76k mi. Around 40k miles I heard a clicking noise coming from under the dash and dismissed it for quite some time. Then after a while I noticed if I took the vent control knob and turned it one click back from full top vents, the clicking noise went away. So I just left it there and drove for some time (a couple of years now). About a week ago I was leaving work and started the truck turned on the A/C full blast and I couldn't get the top vents to blow air. It was like the control gate would only go from floor vents to de-frost vents, no top vents. It's an intermittent problem but I believe it has to do with either the control box where the knob is or a relay on the gate has a bad solder joint. Which may be what the clicking noise is.
Anybody have this issue before? How did you fix it?
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Release the stops on the glove dox door & let the door all the way down, There will be a opening in the dash. You will be able to see the HVAC harness (pictured). Check the harness to see if the metal dash support has worn into some of the wires. Check this first & get back to me.
If this is not the problem you need to retreive the codes from the HVAC module. A Tech 2 scan tool is the only one i know of that can do this, even my overpriced Snap-on scan tool cant.