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Old 11-23-2012, 12:11 PM   #70
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Join Date: Aug 2011
Location: Reading, Pennsylvania
Posts: 814
My Ride: 03 325xi, 01 325xi
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Not a good idea for several reasons: when the A/C is off, there is little load applied to the engine, performance gain(s) by removing the belt would be very slight. However the biggest reasons for not removing the belt are: when you turn the defroster on, the A/C runs to help pull the moisture out of the inside air AND by running the A/C every time the defroster is used, helps to keep the A/C system charged longer, i. e. keeps the seals lubricated and refrigerant from leaking. Hell, you can run the A/C all year round and set the temperature for what you want and still toast yourself out, and at the same time, reduce the moisture within the car's interior.
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