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      12-02-2012, 04:42 PM   #3
Private First Class

Drives: x3
Join Date: Apr 2012
Location: chicago il

iTrader: (0)

in some cars the compressor runs all the time regardless of what u set it at. the defroster activates the air compressor so its basically the same thing, if you turn on defrost it turns on a/c. if the air is on, at least in my humble experience what happens it that the air is routed differently so there is more cold air. up to you but I dont know if you save a lot its not like old cars that a.c visibly affected performance