HVAC controls not working

[gahammerle]

I'm not getting the blower to work on any setting. When I turn the key to On and then turn the fan control on, the clutch on the AC compressor engages and disengages when I turn the fan off. The clutch engages whether the AC button is depressed or not - is that normal? The light does light up on the AC button when pressed.

Not sure if this is related or the cause - but last week I jumped a friends truck and the jumper cables were hooked in reverse on my battery (don't ask ) for a few seconds - burned my thumb yanking the cables off - those things heat up quick! I didn't drive the truck for a few days after that so I don't know if the blower was working after that mishap and quit working later - my wife drove the truck but doesn't remember when the blower worked last. I checked fuses in the fuse panel and under the hood and they look good. As far as I know, everything else electrical is working fine.

Any ideas?

 

[aggar]

Check all your fuses under the hood and beside the dash.

 

[Sparky8370]

Could also be the resistor, but I would think it would still work on high. Yes the clutch does kick on whenever the fan switch is on for some reason. I don't know if it stays on or not, but I noticed when playing with EFI Live. I set the idle my idle real low, but set it to jump up to almost normal idle if the AC was on. I noticed that I didn't even need to turn on the AC for the idle to rise, just turn the fan knob. I know the older ones used to cycle the AC pump to keep it from locking up.