a/c and vent problem

[cool_as_crap]

Hi Guys,

I just had my a/c charged and was blowing cold air. On my way home everything was working well, had 50/50 blend between dash and floor vents. As I was almost home the air stopped coming out of the dash and only came out of the floor. I moved the switch around but couldn't get it to come out of anywhere else. At the same time the a/c light on the hvac panel stopped working and the air started blowing warmer.
I checked fuses but didn't see any that were blown. Has anyone else experienced this? I figured if the blend door stopped working it would just stop in the position it was in.
Thanks for any help!

 

[DerekTheGreat]

Which truck is this, the '92 or '00? I'm assuming the '92 as you said HVAC panel & not knobs..

My experience with both my '88 & '89 trucks has been the blend door motor just in front of and to the right of the gas pedal. Hard to miss that servo/motor thing as it's kinda shaped like a triangle and has an opening in it for the blend door shaft to slide into. 3 or 4 7mm? bolts hold it in place. If that's not your issue or first thing you could try is cleaning the contacts of your HVAC panel. Once you get the dash apart & it out you'll see it kind of resembles a Nintendo cartridge. Clean the contacts with an eraser or alcohol & Q-tips, plug it back in and see if that cures it.

 

[kennythewelder]

You may want to check the control panel for the AC. If all was working well then all of at once quit, it could be a short, or control panel issue. I would try a salvage yard swap before taking the dash appart, but thats just me

 

[cool_as_crap]

Which truck is this, the '92 or '00? I'm assuming the '92 as you said HVAC panel & not knobs..

My experience with both my '88 & '89 trucks has been the blend door motor just in front of and to the right of the gas pedal. Hard to miss that servo/motor thing as it's kinda shaped like a triangle and has an opening in it for the blend door shaft to slide into. 3 or 4 7mm? bolts hold it in place. If that's not your issue or first thing you could try is cleaning the contacts of your HVAC panel. Once you get the dash apart & it out you'll see it kind of resembles a Nintendo cartridge. Clean the contacts with an eraser or alcohol & Q-tips, plug it back in and see if that cures it.

This issue is in my 2000.

I was thinking it may be the blend door motor but the way it stopped working all of a sudden seemed unlikely. The one in my 92 died and it made that clicking noise everytime I drove it until I changed it.

You may want to check the control panel for the AC. If all was working well then all of at once quit, it could be a short, or control panel issue. I would try a salvage yard swap before taking the dash appart, but thats just me

Good call, I think the control panel might be the likely culprit. I'll test it before ordering a new one, thankfully it's under $150 at summit.

 

[cool_as_crap]

New a/c panel solved the issue, though i could have repaired the old one.
Some gunk found its way under this floating wire-board dealie and stuck the contacts down to the plastic.
IDK where gunk came from

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