Car Defrosters?

Question:
Why is it that when one defrosts the windscreen of a car,(full heat) the A/C compressor kicks in. This happens to all the cars I have driven with Air Conditioning.

Answers:

Mystery Crankshaft?

This is on all cars with A/C. Reason is the as the outside air is drawn in it goes through the A/C and the moisture condenses on the elements. Then through the heater core and gets warm. So you have warm DRY air to defrost your glass.

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Ever see a car on a hot day sitting, idling with the A/C on and water dropping on the ground? Same principle, the moisture in the air condenses on the A/C before entering the cockpit.

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Easy Cheesy.. have a good day

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You may be hearing the blowers kicking in not the a/c.
Does it feel like cold air is blowing unto your windows.?
Check your settings in your car..or have your thermostat check to see if it is working properly.

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Just as shovelkick said.....

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Shovelkick gives a good explanation of why you hear the A/C compressor running in defrost. And he,s exactly right.
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