Quote:
Originally Posted by DoomsdayJesus
When I turn on the auto climate control my A/C is constantly cycling on and off at idle regardless of temperature, even with the heat on. I don't know if it's a dehumidifying feature or what, but it noticeably affects my mileage even in cold weather when I just leave it on. It's really annoying.
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It stops when ambient temperatures drop below about 3C.
If you have auto climate control the AC light actually goes out.
You can't dehumidify freezing air using a conventional automotive AC unit because the humidity in the air blocks the evaporator with ice.
Also, unless the car interior is also freezing simply heating the air as it passes into the cabin also "dehumidifies" it by reducing the relative humidity, which is all that matters.