#109919 - 11/09/05 02:25 PM
Why do auto climate controls turn A/C on at 38 degrees?
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Junior Member
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Registered: 08/03/03
Posts: 5
Loc: St. Louis, MO
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On my 2000 GTP with automatic dual climate controls, every time I start the car (if it is above 38 degrees Fahrenheit outside) the A/C will come on.
I have to turn it off every time I start because, clearly, I don't need A/C when it below 60 or 70 degrees. It's a nusaince that really defeats the purpose of automatic A/C controls.
Is there any way to reprogram the PCM to raise the temperature threshold at which A/C will remain off?
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#109920 - 11/09/05 03:31 PM
Re: Why do auto climate controls turn A/C on at 38 degrees?
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Member
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Registered: 05/23/03
Posts: 8078
Loc: Austin, TX
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Does it blow cold?
Just because the A/C is on, doesn't mean it's blowing cold, It's conditioning the air.
_________________________
Bobby
Died 5/1/08, resurrected 5/15/08
ASCD SD hood, 17" Bullitts, Overkill PCM, 3.4" Pulley, NGK TR55IX, K&N 9" cone filter, JimmyC D/P, U-bend removed, Flowmaster 40 series, Hooker big bore tips with resonators, S/B brake lines, drilled/slot rotors, GMPP handling kit, KYB struts, F&R strut supports, HID's, LED's, 2.5" Air Dam, red GTP overlays on custom badges, white rear insert.
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#109921 - 11/09/05 04:38 PM
Re: Why do auto climate controls turn A/C on at 38 degrees?
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Junior Member
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Registered: 08/03/03
Posts: 5
Loc: St. Louis, MO
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I am almost afraid to ask, but just how is it "conditioning" the air in your understanding?
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#109923 - 11/10/05 12:36 AM
Re: Why do auto climate controls turn A/C on at 38 degrees?
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Member
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Registered: 05/01/02
Posts: 2126
Loc: Portland Or.
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Hello,
The A/C assists with defogging when it's cold......
The freezing coils collect the humidity, and trap it from condensating on your windows. The air coming out of the vents will be warm because the A/C is not working at full power.
If your windshield is fogged on the inside, it will clear much more rapidly with the A/C on. It will still blow warm, but the A/C coils will pick up the moisture in the air as is passes by them. This also holds true if you are having a problem with your side windows staying clear on the inside. The A/C will assist in keeping them clear.
Later now,
Clint
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#109925 - 11/10/05 07:15 AM
Re: Why do auto climate controls turn A/C on at 38 degrees?
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Member
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Registered: 05/13/05
Posts: 148
Loc: Cartersville, GA
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Clean windows help a bit too...
_________________________
2003 GP GTP
Victory Red
Mods: Pulley Boys 3.4" pulley, JimmyC downpipe /w cat, MSD 8.5mm plug wires, Taylor plug boots(Red), NGK TR-55 IX plugs, Thasher CAI, MAP Throttle Body Spacer, MAP Exhaust heat shield, GMPP handling upgrade kit, Energy Suspension Poly bushings, 97-02 Lotek A-pillar(3 gauge), Autometer Sport-Comp guages (boost, oil pressure, transmission temp), SilverStars Halogen bulbs, Blazertech 2200 foglights, Hawk HPS pads, F-body brakes, and rebuilt tranny....
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#109926 - 11/10/05 08:12 AM
Re: Why do auto climate controls turn A/C on at 38 degrees?
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Junior Member
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Registered: 08/03/03
Posts: 5
Loc: St. Louis, MO
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Thanks for the lesson in condensation.  Anyone have an answer for the question? Can the the car be reprogrammed to modify the temperature at which the A/C comes on automatically? How? I am usually not overwhelmed by humidity when the temperature is below 70 degrees.
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#109928 - 11/10/05 06:09 PM
Re: Why do auto climate controls turn A/C on at 38 degrees?
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Member
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Registered: 12/01/04
Posts: 483
Loc: Colorado Springs
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Mine used to come on all the time, now it comes on every once in a while when it's really warm outside like about 78 or so............are my sensors going bad or what?
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