Q about dual air

[Docbliss]

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 with 2 a/c's going. True?? thoughts?
Thanks, this forum is a great resource!!!
Docbliss

 

[dave/angie]

I believe the rear A/C unit has an electric motor that runs that pump, so that would not affect your gas mileage at all.

 

[Docbliss]

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 unless the front a/c button was lit... interesting.. not sure how it applies to gas milage but i will continue to test...