MacGyver

I'm having intermittent issues with the heat and A/C controller in my 1999 Silverado:

• Lights for recirculating and fresh air are both out (one or the other should be on)
• A/C light stays on and I can't turn it off
• Rear defrost button doesn't do anything
• Defrost/dash/floor selector doesn't do anything
• Temp selector doesn't do anything, all I get is cold air
• The fan speed control DOES work though

Sometimes it works normal, sometimes not. Any ideas?? It's still winter here and I need my heat and defrost!!

FIXX

iTrader: (2)

First if you have access at a scanner check for body control codes,,(BCM) if no codes then check for a blown fuse?? ma be cig lighter?? of a constant feed to the control switch...if you have a good ground and all the power leads have power suspect the whole control unit...they are between 90 and 150 bux for a new one and are common to fail..

MacGyver

Not a blown fuse because it's an intermittant problem. I have a scanner, but I'm not sure it reads body codes. I'll check.......after the race is over

MacGyver

Just checked, no codes.

pullmytrigger

You better "MacGyver" something up......

MacGyver

LOL! If I can't find the real problem, I have the duct tape, Swiss army knife and a paperclip ready