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#1
11-19-2009, 09:29 PM
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Dumb Defroster Question
Ok, this is going to sound really dumb, but I seriously have no clue how this works. I heard that when you turn on your defroster, the A/C is on to dehumidify the air. Is that true? How does the air stay hot if the A/C is running too? This concept is completely losing me, so if someone can explain it in small four-letter words (just kidding) that would be great.
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  2000 Pontiac Grand Prix GTP 3.8L SII V6 S/C 2000 Jeep Grand Cherokee Limited 4.7L V8 ---------------------------------------------------- 1996 Chevrolet Camaro Z28 5.7L V8 1993 Chevrolet Suburban K1500 5.7L V8 1991 Ford Probe LX 3.0 V6 1986 Ford Tempo GL 2.3L 4 cyl. 
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#2
11-19-2009, 10:17 PM
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Re: Dumb Defroster Question
The AC isn't on per say, the compressor runs. I'm not exactly sure how it works, but for defrost it doesn't compress as much freon as in AC. (I think anyways). Look up the GM V5 compressor.
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-2000 Grand Prix GTP 170,000mi (daily driver) -2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal) -1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix]) AF "2.0" Community Guidelines Conservative Victory 2012!!! "I'll Keep my Guns, Freedom, and Money. You can Keep the Change!" ----->>>>> Did You Know? <<<<<-----
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#3
11-19-2009, 10:48 PM
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Re: Dumb Defroster Question
Quote:
As the air is cooled, it's 'dew point' decreases. The excess moisture is removed from the air in the form of condensation, which drains off the evaporator. Click here for more info This means the air is now drier, but cold. Then the air passes through the heater core where it is warmed up. So now you have hot, dry air that is directed on the windshield. Usually, this makes a big difference in the speed of the defrosting on warmer days. A defroster without a working AC component often takes a lot longer to clear up a foggy window. Of course, in a real, cold winter's day, the outside air is already very dry and cold, so the AC is not needed and usually does not switch itself on.
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#4
11-19-2009, 11:27 PM
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Re: Dumb Defroster Question
That was a fantastic explanation, thank you! So on our cars, if we hit the "ECON" button, would that force the A/C compressor to stay off?
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2000 Pontiac Grand Prix GTP 3.8L SII V6 S/C 2000 Jeep Grand Cherokee Limited 4.7L V8 ---------------------------------------------------- 1996 Chevrolet Camaro Z28 5.7L V8 1993 Chevrolet Suburban K1500 5.7L V8 1991 Ford Probe LX 3.0 V6 1986 Ford Tempo GL 2.3L 4 cyl.
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#5
11-20-2009, 08:27 AM
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Re: Dumb Defroster Question
Not a dumb question what so ever. I think many people are somewhat confused about this...Including me. Good question..Great explanation.
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1997 GPGT 3.8 Dark Teal Metallic. 222000 4 door sedan No Mods
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