AC blows hot after driving 10 minutes on 2004 Subaru Outback

I have a 2004 Subaru Outback LL Bean H6 3.0. The AC works great idling in the parking lot, but after driving for about 10 minutes it starts blowing warm air. If it sits overnight it works again until I drive it. Any ideas?

by in Sterling, VA on August 10, 2010
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3 answers 1 comment
ANSWER by , August 11, 2010
There can be a few issues that will cause this, A/C Compressor clutch, pressure switch or another electrical issue. I suggest having a Subaru shop look at this to determine what is wrong. You can look here to get an idea of what a diagnosis for this will run you: And find a shop here: Good Luck!
ANSWER by , August 12, 2011
Did you ever had your car fixed? What was the problem? I also have an Outback, LL Bean with the same problem and I would like to get more info before expending more on parts and fixes that doesn't fix the problem. Thanks, Jim H
COMMENT by , August 17, 2011
Yes, finally. Subaru has a service bulletin 10-74-02 for an updated AC compressor revolution sensor which turned out to be the problem.
ANSWER by , August 07, 2014
Update on the 2004 Subaru Outback A/C problem. The updated A/C compressor revolution sensor fix only lasted a few months. Turns out the compressor clutch had worn to a point where it would quit turning after it got hot due to the air gap being greater than the spec of .0017. You could fix this by replacing the compressor with a new one or by removing the A/C clutch, cleaning it up and returning the gap to spec. The A/C clutch is pressed on, so you need a special clutch removal tool to do this job. If you bend the clutch when removing it, you will need to get a whole new compressor, which is pretty expensive.