AC Vacuum Pump and Oil

[Dynomite]

Originally Posted by vilant

Here's the fuse block on the passenger side. The 2 fuses are 15A CTSY fuse and 25A A/C fuse. The clutch relay should be fed from 25A. Not sure why you have a 10A for CTSY (if that's what you're talking about).

The fans (heater/air) do not work either as they stopped at the same time I lost power to the Pressure Cycling Switch.

I think everything else is working as far as I know. The Heater Controller on the dash I prolly messed up by jumping the Pressure Cycling Switch too many times in succession

I have an extra Heater Controller from a 90' Corvette that looks identical...which I may just switch as an experiment.
That switch should take an hour and then I can eliminate the Heater Controller as the issue. I will take a picture tomorrow of that experiment.

The lesson learned will be.....do NOT Jumber the Pressure Cycling Switch to get the compressor working but rather hot wire the compressor at the Pressure Cycling Switch connector (12 volts directly from battery to A/C Compressor) after determining which lead at the switch goes to the A/C Compressor.

I was going to check the A/C Clutch relay but thinking on it....that would not effect the Heater/Air Fans.
Is your schematic a 90'?

This is a 91' passenger side fuse block...I have a 15 amp for CTSY and a 10 amp fuse there for AC