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Old 06-09-2008, 11:46 PM   #1
AndyG
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A/C Problems

Hello all.

I have a 2001 SE with 90k. I bought it last November, and the A/C has not worked since then. The light on the dashboard switch comes on, but I can't feel/hear the compressor engage. There's a plug with two wires on the compressor, one ground wire and a (if I remember right) green/yellow wire. I tested these with a multimeter and the ground seems good, but the green/yellow wire doesn't show any voltage with the ignition on, engine running, and A/C switch on.

Any ideas where I go from here as far as troubleshooting? I didn't check the switch for continuity yet, I'll do that next. There's an A/C relay under the hood, but I'm not sure how to test it. Thanks

Andy


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Old 06-10-2008, 11:10 AM   #2
TboneGreen
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I have the EXACT same problem and posted here looking for help, and all i got was "get a haynes manual..."

and well, i ordered one on ebay and am waiting for the sucker to show up in the mail... and its been a while :(

but hell, i hope we can get this figured out!!!
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Old 06-10-2008, 12:08 PM   #3
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> but the green/yellow wire doesn't show any voltage with the ignition on, engine running, and A/C switch on.

There are many conditions that will stop power from reaching the compressor clutch. The most common is a loss of A/C refrigerant, causing the pressure to be so low that the low-pressure cutoff switch blocks power to the compressor clutch.

On a vehicle that age, the most likely problem is that the A/C system has a leak and has lost pressure.
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Old 06-10-2008, 12:38 PM   #4
AndyG
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Ahh... I didn't realize there was a low pressure cutoff. I'll have it tested and go from there I guess. Thanks

Andy
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Old 06-10-2008, 02:44 PM   #5
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> Ahh... I didn't realize there was a low pressure cutoff.

Yes, virtually all auto A/C systems have it so that the compressor doesn't destroy itself if the refrigerant is gone.
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Old 06-10-2008, 04:54 PM   #6
oddballish
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As well as a low pressure switch most have a high pressure safety too . It could also just be a bad A/C relay
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Old 06-10-2008, 06:35 PM   #7
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> It could also just be a bad A/C relay

Correct.

I myself would use a multimeter and a wiring diagram to trace back from the compressor and see where the power is being stopped.
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Old 06-10-2008, 07:15 PM   #8
AndyG
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I swapped the low beam and A/C relay, and the relay is good. I don't have a wiring diagram - any suggestions for sources besides buying a chiltons or haynes manual?
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Old 06-10-2008, 10:29 PM   #9
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If you work on your own vehicle, spending $15-20 for a manual is a wise investment.
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