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Old 12-21-2011, 11:17 PM   #1
elohdaeh78
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2005 WRX
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Default AC compressor won't engage, help

So my ac compressor just stopped working today. I checked the belt and its fine, the clutch is smooth as butter and the fuse is not blown. I looked at all the connections, plugs and wires and they all look okay, however when I turn the ac on nothing happens at all. It doesn't engage, or even try to engage like its not getting the signal to turn on. Any ideas?
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Old 12-21-2011, 11:31 PM   #2
Mulder
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The system has a leak and enough refrigerant has leaked out to activate the low-pressure cutoff switch. Take it to a shop and have them put gauges on it, they will probably confirm that the system is either very low or empty. Next step is to locate the leak and repair it.
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Old 12-22-2011, 09:55 AM   #3
elohdaeh78
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Quote:
Originally Posted by Mulder View Post
The system has a leak and enough refrigerant has leaked out to activate the low-pressure cutoff switch. Take it to a shop and have them put gauges on it, they will probably confirm that the system is either very low or empty. Next step is to locate the leak and repair it.
Thank you, I will take it to a shop to figure that out.
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Old 03-17-2012, 03:59 PM   #4
skep18
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Hey, I have the same issue. Any follow up on whether or not that was the issue? Though it seems painfully obvious that it is, haha.
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Old 03-19-2012, 10:24 AM   #5
skep18
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curiosity bump
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Old 03-19-2012, 01:03 PM   #6
CRAZYHAWK
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In the past I've used this product with good results on my 2001 Audi A4.

http://www.google.com/products/catal...d=0CH4Q8wIwAQ#
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Old 03-19-2012, 02:36 PM   #7
elohdaeh78
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I put more refrigerant in the system and the compressor now engages...next step is to find the leak.
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Old 03-19-2012, 04:50 PM   #8
CRAZYHAWK
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The product I used has a stop leak in it.


Quote:
Originally Posted by elohdaeh78 View Post
I put more refrigerant in the system and the compressor now engages...next step is to find the leak.
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Old 03-19-2012, 04:53 PM   #9
skep18
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Quote:
Originally Posted by CRAZYHAWK View Post
The product I used has a stop leak in it.
Is that potentially harmful for the compressor in any way? I know sometimes these stop-leaks can potentially clog things up in the system. Thanks.
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Old 03-19-2012, 06:04 PM   #10
skep18
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The Owner's Manual and the label on the AC heat exchanger lists the refrigerant as being HFC134a. Is this ok to mix with the "recharge kits" that use R134a?

Edit: Sooo indicators online seem to point at they're the same thing... anyone confirm? Thanks.

Also, any more opinions on the "stop leak" solutions?

Last edited by skep18; 03-19-2012 at 06:12 PM.
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Old 03-19-2012, 08:15 PM   #11
CRAZYHAWK
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If you just add one container with the stop leak, it should be good.
They are the same (hydroflurocarbon).

Quote:
Originally Posted by skep18 View Post
The Owner's Manual and the label on the AC heat exchanger lists the refrigerant as being HFC134a. Is this ok to mix with the "recharge kits" that use R134a?

Edit: Sooo indicators online seem to point at they're the same thing... anyone confirm? Thanks.

Also, any more opinions on the "stop leak" solutions?
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Old 03-19-2012, 09:01 PM   #12
awdtoy
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i had the same problem. Leak was at the lines going in the compressor. Replaced the Orings and everything is fine now.
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Old 03-20-2012, 06:24 PM   #13
skep18
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Quote:
Originally Posted by CRAZYHAWK View Post
If you just add one container with the stop leak, it should be good.
They are the same (hydroflurocarbon).
Quote:
Originally Posted by awdtoy View Post
i had the same problem. Leak was at the lines going in the compressor. Replaced the Orings and everything is fine now.
Yea, just for posterity, I bought a refill can and it took almost all 16oz. Cut the engine off and heard a hissing. Found the leak at a mating point. Knowing moisture probably got inside, I took it to the dealership to have the system placed under vacuum before recharging, otherwise I'd have done it myself. They found 2 leaking o-rings. Replaced them. $244 + tax... Not thrilled but better than destroying an AC compressor over time.
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Old 03-30-2012, 05:51 PM   #14
ryanschram
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same problem, i had the system refilled and it still will not engage, even after installing a new compressor and relay. the fuse is good too. seems the ecu is not sending the ground signal to the relay.

Thoughts?
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Old 03-31-2014, 08:48 PM   #15
CalvinT
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I know this is an old thread but something else can keep the A/C compressor from energizing. I'm posting because this thread came up during a google search for A/C problems.

Underneath the instrument panel there's a little button (white on my WRX) that's mounted to the clutch pedal arm. It activates a switch (clutch cancel switch) when the clutch pedal is released. If that button is broken the A/C clutch will not engage because the switch doesn't get activated.

I had a similar problem with my WRX, no A/C. I was going to order a pressure switch when the mechanic at the local dealership mentioned that button. In my case it was broken, replacing it fixed my A/C. P/N 36036AA080, but check with the dealer.

This switch does not show up in the A/C wiring diagram because it goes to the ECU.

It also disengages the cruise control when you push the clutch pedal.

Read this link for more info. http://forums.nasioc.com/forums/showthread.php?t=940269

There are two buttons on the clutch pedal arm. Make sure they're both OK.
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