I may be charged too low or too high. What are the pressures?
I would not jumper an A/C system to get it to run.
I always replace orings and charge Subaru's without vacuuming or replacing anything. Subaru's routinely go 100,000 miles without issues. Subaru A/C systems are robust and rarely have issues. I never replace receiver/dryers in Subarus, though they're inexpensive so why not on one that's so old? While things can happen, and they may be more common in other manufacturers systems - they very rarely happen in Subaru's. Here's my write up with 14 pages of other people that have done the same over the years:
So far not one person has come back to say they're A/C exhibited issues. Same here, I've never seen a failure after I've worked on a Subaru a/c system.
I ***would not*** apply this approach to other less-robust systems on other manufacturers vehicles.
I totally understand people who are scared or uber-technical and that has it's place. But realistically speaking there are plenty of people that appreciate an approach that's inexpensive and has a high percentage of success.
All that being said - it needs properly diagnosed. what was the original issue?
If the pressures end up not being the problem then look into
1. relays in the system
2. the a/c compressor clutch
Edited by grossgary, 23 July 2014 - 10:48 AM.