My 1985 300 turbo diesel's ac was working perfectly until I changed the driver's side motor mount. I jacked up the motor as perscribed in the manual. It all went surprisingly well.
When I was finished, I noticed that a couple of the vacuum lines got disconnected from the 'harness' on top of the left front fender well, while I was sticking my hand through to position the motor mount. They weren't marked, so I stuck them back to where they looked like they came from. Do they have anything to do with the ac? I checked all the fuses, all good. Changed the ac fuse just for gp. Still, the compressor does not kick on. All other climate controls work. Fan , heat, temp dial. I think I looked at every wire connected to the motor, just in case I inadvertently snapped one when I jacked it up. Also, I pressed the pin in the low pressure hose and it was pressurized, from what I could tell. It looks like there's a bubble in the window on top of the 'can' too.
What did I miss? Is there hope to be able to fix this myself?
Thank you in advance for any suggestions.
aj1253@yahoo.com

Art

 

If you jump the low pressure switch on the dryer (thats the big one with 2 spade connectors on it) and the compressor runs, then the system is low- have to get it checked for a leak. If still not- I would guess the connection at the compressor clutch (notarious sp?) or a bad compressor - its a GM R4 and they were shaky quality at best.

 

I was looking at the list of ac parts with photos attached. Thinking I may have to locate and mess with all of them right off. You have given me somewhere accessable to start. I'll be checking it out this weekend.

Regards,

AJ