I know I probably just need to take it into an A/C shop, but before I do I just thought I throw it out here for any possible easy fixes.
My 95Z has the 134a system. I can't seem to get the clutch to engage. I put freon into it, and is all up to pressure. Still nothing. I then notice someone had the compressor unplugged, so I fished around the engine bay and found it and got it hooked up again. Still nothing. I was told it could possibly be one of my switches, either the high or low pressure switch. Anyone ran into this before? Also I'm not throwing any SES codes for A/C. I'm open to any thoughts. Thanks all!

 

My car has a couple fuses and a relay relating to the AC, and if it goes out won't set the SES light. Just an idea on something to check.

 

Thanks, for the suggestion, sorry I forgot to mention the check the fuses and the relay. I switched 2 relays around and still didn't get anything. I assume the relays are all the same, I may be waaaaay off on that one though.

 

Dunno. Something's going on if someone disconnected it intentionally though.

 

There's a pressure switch on the drier that can fail. You can pull the plug and jump across the connections on the pigtail to see if that is the problem.

 

Try to pull the PCM BAT fuse for about 30 secs. On my 94 it is on the end of the dash drivers side. This will clear the code in the computer indicating the system is too low on pressure. Assuming your R134 is full enough and no other issues this will allow the compressor to kick on.

 

On a '95 the PCM fuse is under the hood in the fuse box, #8.

 

Thanks, i've tried clearing the pcm, no luck. I'll give the switch a check next.

 

Doesn't the clutch need to engage to put 134a into it?

 

Thats what I was thinking, but if it's low on freon it won't engage either, and somehow it pulls enough freon in to the system start engaging when you fill it up(not mine though )

 

If the system is low on freon then no, the clutch will not engage. You can get the clutch to engage by bypassing the refrigerant pressure sensor.
http://shbox.com/1/refrigerant_sensor.jpg

 

I also had to short across the A/C relay in the fuse box under the hood to get my clutch to engage and charge it.