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A/C always on

 
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  #1 (permalink)  
Old 22 Sep 2017, 11:26 pm
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Join Date: Sep 2017
Posts: 3
Default A/C always on

I looked thru the thread and couldn't find this problem, and if I missed it I apologize. I have a 01 Pt cruiser 138k for mileage. the problem I am having is when I turn the cabin fan on and have the temp set to cold/cool the a/c comes on. Now if I move the A/C dial to A/C nothing changes air is still cold, If I turn the heat on and the cabin fan is on the A/C comes on. So no matter what I do the A/C and cooling fan come on once the cabin fan comes on. Any pointers or ideas would help greatly.
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Old 23 Sep 2017, 06:55 am
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Posts: 27,744
Default Re: A/C always on

If I understand what your saying, it's working properly. The A/C is giving you dehumidifying air so the windows don't fog up, otherwise without the A/C the cabin air alone would cause the windows to fog up and cut visability.
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Old 23 Sep 2017, 09:53 am
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Join Date: Sep 2017
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Default Re: A/C always on

ok so a/c is always on even when heat is called for? the other issue is that the cooling fan, is always on when cabin air is on a/c, heater, or just t move the air around, that fan is on, Is this normal to? Thank for the help also been driving me crazy.
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Old 23 Sep 2017, 11:00 am
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Join Date: Sep 2001
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Default Re: A/C always on

OK, I think we might have our terms mixed. First, the Hot/Cold dial (red/blue 3rd dial from the left) will override the A/C dial (first dial). Even if you want ice cold air, if you have the red/blue dial at full red, you'll get hot air over the A/C air. Second, if you want air without the A/C, use the first dial (blue/white) on the white side BUT if you have the selection dial (2nd dial) on the DEFROST selections, the A/C will come on to give you the dehumidifying air.

Here's something to try: The 4th knob from the left is the "outside air" and "recirculated/cabin air". Turn that to Recirculate. Now turn the selection knob to the DEFROST (all the way to the right). As you turn the selection knob to the defrost mode you should see the recirculate knob switch over by itself to the outside air. That's because in DEFROST mode the A/C turns on for dehumidifying air so the widows will clear and the A/C draws outside air.
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  #5 (permalink)  
Old 23 Sep 2017, 08:39 pm
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Join Date: Sep 2017
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Default Re: A/C always on

Ok, did your test, and everything works the way you said it should. thank you for clearing it up for me.
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Old 30 Sep 2017, 04:52 pm
Young Cruiser
 
Join Date: Nov 2015
Location: plant city fl.
Posts: 73
Default Re: A/C always on

either a defective head or a stuck on A'C clutch relay or the compressor clutch is seized and not longer requires power to turn.. I would remove the A/C relay and try it,if the compressor still turns, I would unplug the compressor at the compressor and recheck..
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