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      11-25-2012, 09:28 AM   #4
hinckley
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Drives: MY13 M5 6MT
Join Date: Mar 2010
Location: Boston, MA USA

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Remember that when the A/C button is "on" (green light is lit) it doesn't mean that the A/C is running. It only means that if the climate control system determines that cooling is necessary, the A/C compressor will automatically be switched on. When the A/C button is "off", it's really in economy mode and the A/C compressor will not be switched on regardless of temp.