AC Vacuum Pump and Oil

[scottfab]

I am not where I can look at the 8A manual or the car.
but if memory serves the fuses are labeled.

Originally Posted by Dynomite

Hi: That is NOT sad......That is Happy
So where is that fuse block on the car and is there a 25 amp A/C Fuse in that block?

I am presently looking at the A/C Clutch Relay (VetteVet on the phone explaining it is second relay to right of steering Column)
I am checking to make sure I have HOT at the relay with engine running. And then Hot after the relay. I have no voltage at the 10 amp A/C fuse on right passenger fuse panel. No voltage at A/C High Pressure Cut out switch or A/C Pressure Cycling switch.

This all happened when I was poking around with a hot wire and you know how that goes
I am soooooo close......

Cliff

[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).

[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

[vilant]

All information and pics are from the 1990 Section 8A Electrical Diagnosis Supplement. I can't say what is needed for anything after 1990 ( but I assume 91 should be the same), but on a 1990 there should be a 25A fuse, not 10A on the A/C fuse space.
P.S. If you look on pg 8A-66-1 of the pics I gave you, you'll see there's a 5A A/C underhood fuse on the line that gives input to the heater/ AC programmer from the output of the blower power module. There is also a fusible link that feeds the blower control module. If the link is completely blown, the blower will not work (I'm assuming the heater programmer will not work properly without input(voltage) from the blower power module output, which is protected by the 5A fuse).