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Old 02-21-2011, 07:31 PM
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Does your A/C compressor run full time also?

Even when the A/C and Auto are off, the air blown out of the vents feels colder than the air outside. Does anyone else have the same issue?

I popped the hood to confirm. I was right-- The A/C compressor cycles on and off about every 5-10 seconds. The temperature setting doesn't matter.

I'm wondering if it's doing this intentional for humidity or something? If so, that's annoying. I don't need to be robbed of power when it's 60 deg F outside.
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Old 02-21-2011, 08:08 PM
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Re: Does your A/C compressor run full time also?

I hadnt honestly thought about it. I havent had too much nice weather here yet so my air has been on full time. I will experiment and let you know though. Im curious now.
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Old 02-21-2011, 08:10 PM
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Re: Does your A/C compressor run full time also?

With just the blower on, mine is consistent with the ambient temp. Its been about 80 deg. here lately and I have to hit the AC button.
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Old 02-21-2011, 08:34 PM
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Re: Does your A/C compressor run full time also?

BTW, I have the V6. The compressor is on the top right when you're looking at the engine from the front. You can see the pulley, and if the compressor is disengaged, you you see that the part of the metal wheel in front of the pulley is stationary.
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Old 02-21-2011, 10:19 PM
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Re: Does your A/C compressor run full time also?

Quote:
Originally Posted by CrazyJ View Post
Even when the A/C and Auto are off, the air blown out of the vents feels colder than the air outside. Does anyone else have the same issue?

I popped the hood to confirm. I was right-- The A/C compressor cycles on and off about every 5-10 seconds. The temperature setting doesn't matter.

I'm wondering if it's doing this intentional for humidity or something? If so, that's annoying. I don't need to be robbed of power when it's 60 deg F outside.
I have the V8 but yes, the air coming out of the vent is colder than the outside air. The Auto mode does not work very well.
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Old 02-21-2011, 10:22 PM
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Re: Does your A/C compressor run full time also?

Quote:
Originally Posted by CrazyJ View Post
Even when the A/C and Auto are off, the air blown out of the vents feels colder than the air outside. Does anyone else have the same issue?

I popped the hood to confirm. I was right-- The A/C compressor cycles on and off about every 5-10 seconds. The temperature setting doesn't matter.

I'm wondering if it's doing this intentional for humidity or something? If so, that's annoying. I don't need to be robbed of power when it's 60 deg F outside.
It will depend on the selection made. If you have it on bi-level or defrost the compressor will be on without showing the A/C button lit. If you just have it on floor or face only it should not run.
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Old 02-21-2011, 10:26 PM
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Re: Does your A/C compressor run full time also?

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Originally Posted by jeep2011 View Post
It will depend on the selection made. If you have it on bi-level or defrost the compressor will be on without showing the A/C button lit. If you just have it on floor or face only it should not run.
But what about "Auto" I have the problem in Auto.
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Old 02-22-2011, 09:24 AM
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Re: Does your A/C compressor run full time also?

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Originally Posted by jeep2011 View Post
It will depend on the selection made. If you have it on bi-level or defrost the compressor will be on without showing the A/C button lit. If you just have it on floor or face only it should not run.
I confirmed this. I'm not sure what setting was on when I tested, but likely had floor+face or windshield defrost.

That being said, if the A/C is running, the A/C light should be on, also giving you the opportunity to turn it off. Regardless of mode. I'm placing this in the category of ridiculous american car bullshit, completely disregarding efficiency and the environment. I drove around town all yesterday with my windows down, sunroof down, and apparently-- A/C blasting.
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Old 02-22-2011, 10:52 AM
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Re: Does your A/C compressor run full time also?

As has been the case on new cars for a long time (decades) the A/C compressor runs anytime you select defrost, even if it's in combination with floor or face. That's because dehumidified air works better to defrost/defog the windshield. I don't think you can (or want to) disable that.

I noticed in Auto mode there's no indication for the A/C, that only becomes active when you exit auto mode, which is what happens when you press the A/C button and toggle the setting.

So far, for me, Auto works as expected meaning I set the temperature and basically ignore it. I haven't had a wide temperature spread but from mid 50's to mid 80's outside temp and a 74 degree inside setting it keep me comfortable so I have no issue.
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Old 02-22-2011, 11:58 AM
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Re: Does your A/C compressor run full time also?

The AC is not as much a drag on the engine as in the "old days" FWIW. If on the highway, it's more economical to run teh AC with the windows up than with the AC off and windows open. Around town, it isn't as much an economic hit as you would expect but I agree it has some impact.
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Old 02-22-2011, 01:01 PM
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Re: Does your A/C compressor run full time also?

The AC compressor will cycle regardless of mode as long as the system is turned on. It is used to dry the air and avoid the windows fogging up.
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Old 02-22-2011, 01:25 PM
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Re: Does your A/C compressor run full time also?

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Originally Posted by woosch View Post
The AC compressor will cycle regardless of mode as long as the system is turned on. It is used to dry the air and avoid the windows fogging up.
Correct and is working as intended and the same way 90+ % of cars out there both domestic and foreign function. You would be surprised how many different manufactures use the same parts suppliers’ these days.

If you dont want the A/C on at all, turn it off...
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