View Full Version : Heater/AC Control Unit


jaredsdad
04-30-2008, 05:33 AM
91 K1500.

My "OFF" button doesn't work on my AC/Heater Control Unit. It stays on all the time. You can adjust between low/med/high fan, and defrost, floor, etc works. It wasn't a bid deal to me but now when I start the truck the "A/C" blinks on and off for 5 minutes or more, then goes off. This happens whether or not I actually have the AC on.

Do you think this is just the electronic unit itself that is fried, or something else I should look at. I'm thinking if I buy a new electronic unit it would fix all the above.

What do you all think?

MStefak
04-30-2008, 08:50 AM
Yeah the problem is the board for the heat controls (The unit itself)

As for the A/C flashing, thats do to the pressure witch kicking off because "there is a problem" which is low refrigerant, just fill it up.

Godd Luck.

jaredsdad
04-30-2008, 06:38 PM
Well...the AC was charged 2 months ago...and had dye put it in. I do not THINK there is a leak....could the A/C flashing be a result of the unit being bad?

is that a possibility?