Quote:
Originally Posted by Enki
Well, it takes power to run the compressor, which is made by fuel, which in internal combustion engines is not 100% efficient. Thus, it will produce extra heat in the engine when running.
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Note I said any "significant" effect. Turning the AC compressor on on my Ranger doesn't change the warmup time enough to measure (and affects the fuel mileage by less than 1/10mpg on a cold engine) On a warm engine it might make a little bit more difference - and it does make more difference at speed.
I can control weather the AC is on or not with defrost on the Ranger because it is a dumb-as-a-rock manual system I installed myself.