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Old 06-17-2009, 02:17 PM   #1
ogboot
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2002 WRX
psm

Default A/C Compressor kicks on and off, on and off - AC Clutch?? IT's HOT here!

So i got my car back from the shop on an unrelated issue to this, and they told me that my AC was acting up but to drive it a little bit as it may just be an issue with the car sitting up for a while that would work itself out.

Here goes:
Turn on the A/C when the car is cold and it will work fine for about 10min. then it starts "knocking"... about every 5 seconds it makes this *tock* and the AC compressor stops, then it gets going again for a few seconds and *tocks* to a stop all over again.

This happens at idle and cruise. I've been told this could be from low freon, but the shop said they checked the freon level and it was good.

Some possibilities:
1) They don't know what they're talking about and it really is low on freon/leaking.
2) A/C Clutch acting up.
3) Random TSB i found on here from searching that exhibits this behavior because of a faulty sensor in the A/C system that misreports system freezing up.
4) A/C system actually freezing up.
5) compressor dying and i should drive car off of a cliff.

I'm going to dig around for my pressure gauge to check the A/C system when i get home from work, can anyone offer some input? Thanks.
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Old 06-17-2009, 03:04 PM   #2
crampfan
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yep, the best thing to do is hook up the gauges. could be a low charge, over charge, or electrical.
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Old 06-17-2009, 03:33 PM   #3
jay25RS
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I had a similar problem... ended up being overfilled... but in your case if no one touched the refrigerant lately, then I vote for...

3) Random TSB i found on here from searching that exhibits this behavior because of a faulty sensor in the A/C system that misreports system freezing up.
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Old 06-17-2009, 03:46 PM   #4
Mulder
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This is not the freeze-up issue. That will only happen when the system has been running for a while, and when it does the compressor will keep running but airflow through the vents will decrease and may stop.
What you're describing here sounds to me like an overcharge condition. When the compressor cuts out from the high-pressure switch it will be more violent than its normal cycling.
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Old 06-18-2009, 04:40 PM   #5
ogboot
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unfortunately i couldn't find my A/C kit so i'm going to have to check and see if Autozone or somebody can at least check the pressure for me when i get off work. doh.
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Old 06-18-2009, 08:38 PM   #6
ogboot
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went and bought another guage, it was only about $20. What do you know, overfilled. Mulder hit it on the head. "Somehow" lost about 5psi of freon and everything is fine so far now.
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Old 06-18-2009, 11:04 PM   #7
wagonovsky
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Somewhere the penguins are crying.

Quote:
Originally Posted by ogboot View Post
went and bought another guage, it was only about $20. What do you know, overfilled. Mulder hit it on the head. "Somehow" lost about 5psi of freon and everything is fine so far now.
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Old 06-19-2009, 12:00 AM   #8
ogboot
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Quote:
Originally Posted by wagonovsky View Post
Somewhere the penguins are crying.
Let's soak up some A/C and have a moment of silence for the penguins...





























ok i'm good now.
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Old 06-19-2009, 10:34 PM   #9
MAJRMSA
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I have a similar situation after having the a/c system charged twice again this summer. The first time I had the famous leak at the high pressure hose and now the a/c clutch on my compressor seizes at random times. I get a sort of violent jerk in the car and a quite a loud thump as well. I opened the hood and noticed the a/c clutch was not spinning normal but rather going back and forth as if it was stuck and making the whole compressor jump. I take the car in it to the shop tomorrow so they can check it out. But does this sound from an overcharge condition? Is my compressor going again? I replaced it once already. As these bugeyes age it seems as if though they are plauged with a/c issues.
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Old 06-20-2009, 11:18 AM   #10
ogboot
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i didn't have any issues at all until they overfilled mine (engine swap). what i noticed is that in the morning and evening (when it was cooler) the A/C was fine, probably because it was lower pressure at those times. However, once the temp rose in the middle of the day and the afternoon I would start having issues, because this would also cause the pressure in the system to be higher. So, in a way I can't completely blame the shop for overfilling it because they charged it in the morning and it was probably ok at that time.

Check out my first post, i've had squeals before from belts but this was quite a thump, and as you mentioned the car would stumble. Good luck with your issue!
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