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Old 01-20-2004, 09:04 AM   #1
overdose
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Default A/C Compressor disabled in cold climates?

I was messin around this morning and noticed when I went to the defrost position the A/C light did not illuminate nor did the cooling fans come on or did that normal slight engine surge occur when the compressor kicks on.... curious I switched to floor and vents then pressed the A/C button, the light illuminated but still... compressor didn't come on, is this normal behavior? it's about ~12 degrees F in my area, was in my garage at the time so that's around ~30 prolly.... never owned a car that disabled the AC compressor when the IATs were really slow, so i'm kinda like hmm
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Old 01-20-2004, 09:33 AM   #2
Kamen
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On either of my Legacies the A/C will turn on regardless of the outside temperature. I'm in Michigan as well so this has been tested in really cold weather. I'll do another test today (it's 12F bellow outside) and if it does not turn on I'll post another message.
Kamen
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Old 01-20-2004, 09:35 AM   #3
heffergm
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The AC light never turns on when you're on Defrost.

As for the compressor being disabled when it's cold, I don't think that's the case.
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Old 01-20-2004, 10:01 AM   #4
overdose
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oh, maybe it just doesn't need to turn on yet and i didn't wait long enough?
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Old 01-20-2004, 03:50 PM   #5
fredj
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I believe there is a preasure switch some where on the cooling systen that keeps it from comming on at temperatures where it would otherwise dammage it self by pushing a slug of liquid back to the compressor.
Fred
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Old 01-20-2004, 09:37 PM   #6
Kamen
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So I did the test: the compressor never moved. It was 10F outside so I guess when it's too cold it won't turn on. I have seen this work many times before but it had never been that cold - maybe above freezing. My compressor works just fine so there has to be some protection mechanism.
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Old 01-21-2004, 12:58 AM   #7
Chav
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There is a temperature sensor in the system. This is why your compressor will kick on and off during the summer. The temperature will reach a threshold and then shut off, warm back up and turn on. etc.

-Chav
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