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Old 06-09-2011, 12:47 PM   #1
Rodlove
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Default AC Problems

I first noticed last week that the AC had stopped working. My first thought was that it was low on rc-134 and tripping the low pressure switch. I added some, and it worked for a day then stopped.

I next added some dye, and found what appeared to be a pretty massive leak around the compressor. Due to the volume of dye, it was hard to tell if it was coming from the high pressure line or the compressor housing.

Next I got some manifold gauges and a vacuum pump, replaced the o-rings on the the high and low pressure lines, pulled a vacuum and recharged the system.

I currently have very high pressure readings on my low side line, and low pressure on the high side. About 90 on the low side and only 100 on the high side, and that was with only 10 ounces of rc-134 (full charge is 16-19 oz I believe). It does equal out in static readings, and held a vacuum, but I hear a hissing noise around the compressor for a few seconds right after I turn the car off.

Anybody have any thoughts? Due to the initial massive leak and the very high low side readings I'm guessing that the compressor has lost it's internal seals etc. and needs to be replaced.

Anybody have any other thoughts on what the issue might be, or what to do next?
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Old 06-09-2011, 01:35 PM   #2
MAJRMSA
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I had hiss around my compressor turned out it was the connection from the high pressure hose, Was not sealing despite me messing with it.
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Old 06-09-2011, 01:38 PM   #3
Rodlove
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Thanks, I'll check that connection again, that is the area where it seems to be coming from. Any idea if that could be causing my very high low side readings? From what (addmittedly little) I know about the AC system it seems like it could be the compressor or maybe the expansion valve.

I may have multiple problems, the leak might only be one. What a pain.
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Old 06-09-2011, 01:46 PM   #4
MAJRMSA
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I have little knowledge about a/c. I love my bugeye but the a/c has been giving me woes for a long time. I just went through my third compressor last month, granted they are all used parts. I replaced my compressor and expansion valve two months ago. Did a evac and recharge and so far it is holding up well nice and cold. I think a big culprit lies with the expansion valve they are known to be notorious on the wrx. I wished I would've changed mine earlier when I had these problems. Good luck.
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Old 06-09-2011, 01:58 PM   #5
Rodlove
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thanks, that's really helpful information. And it sounds like you know more than I do about the a/c given all the work you've done on yours. I think I'll change the expansion valve as a next step, and maybe put some more dye into the system and see if there are still any leaks in or around the compressor.
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Old 06-09-2011, 02:32 PM   #6
Rodlove
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When I pull a vacuum it holds, and when I charge the system up everything looks fine, but as soon as I finish charging and open up the high side on the manifold gauges, I get really high low side readings, up into the retard zone.

Anybody know what this could mean, expansion valve stuck open?
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Old 06-09-2011, 02:47 PM   #7
jonklein611
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Quote:
Originally Posted by Rodlove View Post
When I pull a vacuum it holds, and when I charge the system up everything looks fine, but as soon as I finish charging and open up the high side on the manifold gauges, I get really high low side readings, up into the retard zone.

Anybody know what this could mean, expansion valve stuck open?
Sounds like expansion valve stuck open. That's what throttles the pressure down on the low side.
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Old 06-10-2011, 12:55 PM   #8
Rodlove
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Thanks for the help guys. I'll try the expansion valve and see if that solves it.
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Old 06-10-2011, 08:34 PM   #9
Rodlove
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I was looking at another thread and saw this:

Quote:
Originally Posted by elohdaeh78 View Post
Just figured I would give you an update on my AC. Took it to the dealer with a new used compressor and a new expansion valve. The mechanic went out to my car and looked at it and and within 2 minutes said the compressor was shot. He looked at all the belts and the tensioner and said they were fine (which I figured since I replaced them). I asked him about the expansion valve and he said usually if they are clogged the AC will shut off completely and not skip around like mine does. He said the clutch in my compressor was just shot. He put in the new compressor didn't bother to change the expansion valve and it works perfect, blows cold air and doesn't skip around or make that horrible metal screeching noise. So it was the clutch on the compressor that was shot just as I expected.
Does anybody have any experience with some kind of internal compressor failure, and could it be this and not the expansion valve that is my problem? Right now the system works, but I don't have it charged up fully, so the air isn't too cold and I've not been running it because I'm afraid that the high low side pressure will damage something.
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