[soccerguy045]

If you try to turn on the A/C from inside the car, the clutch on the compressor doesn't pull in (so no cold air blows, but the blower is working). If you jumper the pressure switch on the box on the firewall directly from the battery though, the compressor works (and cold air does begin to blow). I know there could be many, many reasons there isn't any power making it from the inside of car to outside, but I'm wondering if anyone knows of any very, very common places that could cause this (maybe I missed a ground inside, or something?). I may x-post this to electrical forum as well. Thank you.

 

[pmullaly]

'fraid your gonna have to get a test light and start chasing wires.

If you jumper the pressure switch on the box on the firewall

I think you lost everyone there. There is no "pressure switch" on early systems

 

[John_Muha]

Think he means the thermal switch where the green wire attaches to. I typed up a little something in electrical but the 71s are a little different to work on.

 

[soccerguy045]

Originally posted by John_Muha:
Think he means the thermal switch where the green wire attaches to.

That's right, the plug-in that goes to the little tube on the firewall heater box, the one with two green wires. I'm used to saying pressure switch while working on newer A/C systems I guess