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Pontiac Grand Prix Climate Control/AC

192 messages,  Last post on Oct 07, 2009 at 12:19 PM

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What is this discussion about? Pontiac Grand Prix, Heating / Cooling, Sedan


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#2 of 192
Climate control by etcb
Feb 02, 2006 (11:02 am)
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I have a 2005 GXP with 18K miles of problem free driving. I live in Virginia where in the winter the outside tempatures can get quite cold. <40 degrees. However, when I use the auto climate control and set the cabin temp to a comforable 70 degrees the air condition (AC) light always comes on. I sometimes turn the AC off which has no noticable affect on the inside climate. Is the AC light "on" normal when using the auto climate control? Nothing is mention of this condition in the owners manual.
#3 of 192
Re: Climate control [etcb] by blckthree
Feb 02, 2006 (11:20 am)
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Replying to: etcb (Feb 02, 2006 11:02 am)

My '06 does the same thing. I don't think it makes a difference unless you get one of the warmer days when it might turn on the A/C when you didn't really need it. On those 50-60 degree sunny days, I make a habit of turning it off, because I have felt it kicking out air conditioned air. Not sure why it isnt like other GM climate control systems where when you turn off the A/C, it stays off until you turn it back on.
 
Mike
#4 of 192
A/C light Re: Climate control [etcb] by rayainsw
Feb 02, 2006 (11:28 am)
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Replying to: etcb (Feb 02, 2006 11:02 am)

“when I use the auto climate control and set the cabin temp to a comforable 70 degrees the air condition (AC) light always comes on.”
 
I’m not sure I’d use the term ‘normal’ – but I never use the ‘Automatic’ setting – and the A/C light comes on probably 95% of the time when I start the car. Thus it appears to be operating as designed. I have not figured out why it does ** not ** come on occasionally.
 
In the Summer (here in Hot-Lanta) I turn it off when I don’t think I require (or desire) de-humidification. I happen to like fresh air – and almost always, even in Winter, have my moonroof in the vent position. Now, when it is cooler, particularly in the mornings, I just have trained myself to always turn it off - again unless it is quite humid and the inside of the windows requires running the condenser.
 
Just as I adjust the Temp, the steering wheel angle (I set it all the way up on exit), etc. when I start the car.
 
- Ray
Still, at this advanced age, able to learn new habits . .
#5 of 192
Re: Climate control [etcb] by evandro
Feb 02, 2006 (4:28 pm)
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Replying to: etcb (Feb 02, 2006 11:02 am)

Whenever the HVAC is defogging it turns on the AC compressor do dehumidify the air blown at the windshield.
#6 of 192
Re: Climate control [evandro] by etcb
Feb 03, 2006 (7:17 am)
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Replying to: evandro (Feb 02, 2006 4:28 pm)

Make sense, and it is a great feature but shouldn't it shut of automatically after it dehumitfies? I'm thinking that if the compressor remains on, it reduces the gas mileage.
#7 of 192
Re: Climate control [etcb] by blckthree
Feb 03, 2006 (1:22 pm)
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Replying to: etcb (Feb 03, 2006 7:17 am)

I have never actually checked, but I don't think the compressor actually engages during colder weather. You might be able to see the compressor engaged or not by looking under the hood, but not around here, the weather is warm enough that I have felt the A/C coming out of the vents if I didn't have it turned off. I didn't need the A/C, but it was still on.
 
Mike
#8 of 192
Re: Climate control [etcb] by evandro
Feb 03, 2006 (3:45 pm)
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Replying to: etcb (Feb 03, 2006 7:17 am)

The thing is that the auto HVAC doesn't have a moisture sensor, so it just assumes that when the conditions exist for the windows to fog up, it will blindly redirect the air flow and turn the AC compressor on, just in case.
 
Yes, it uses a tad more gas, but it's hardly noticeable in a 200+ HP car.
#9 of 192
Re: Climate control [evandro] by blckthree
Feb 03, 2006 (7:41 pm)
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Replying to: evandro (Feb 03, 2006 3:45 pm)

It's a flaw in the system from my point of view. I have had 3 other GM vehicles with climate control systems and they all had the ability to turn the A/C off. Why doesnt this one? Somebody screwed up when they designed this, but it won't get changed so we have to deal with it.
 
Mike
#10 of 192
Re: Climate control [blckthree] by evandro
Feb 04, 2006 (8:10 am)
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Replying to: blckthree (Feb 03, 2006 7:41 pm)

I had a Stratus with manual AC and the compressor would always come on when set to defrost too.
 
Did your previous 3 GM cars have auto or manual AC?

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