Quote:
Originally Posted by Air&Road
Running the compressor for defrost is the standard method on all cars of any brand with ACC and even some with manual climate control. The evaporator removes moisture from the air. Very useful for defrosting a windshield.
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In the Southeast, i consider working a/c a safety feature especially in the fall and winter. We get chilly rain and if you cannot dehumidify you will completely fog up on the inside in short order.
Operating the compressor frequently is beneficial to its longevity. If it sits idle the seals dry out and it will start to fail.
Side story: I have a 2004 Honda CR-V that has a manual climate control. There is electronics involved but you still have to choose the modes and temperature yourself. I found on a Honda forum an Easter Egg that lets you choose whether it automatically engages the compressor with defrost or not. For some reason the default setting is "disabled".: 
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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)
both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)
1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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