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Did some playing today... Turned off front air and put rear air on full cold... rear air blew hot... put front air on low, made sure a/c button was lit, rear air stated blowing cold.. Seems the front a/c pump is tied to the rear a/c.. tried different variations but rear would not blow cold...

Hey guys, just bought a 2002 Tahoe LT. Was wondering if running the rear a/c in addition to the front makes your gas milage worse? Its hot in Florida and when I first get in i put both on auto 70 degrees, when the temp gets comfortable i turn the rear air off because I think it burns more gas...