The rear AC is blowing hot air when the front is cold why ?? on 2003 GMC Yukon XL Denali

I just realized yesterday on my Yukon Denali 2003 that A/C in the front is cold but the rear blowing Warm or sometimes hot air. For 2-3 minutes it blows cold air in the back then back to heat or natural air. Any reason why?? It has 93K mileage

by in Frisco, TX on April 04, 2010
1 answer 1 comment
ANSWER by , April 04, 2010
low in freon. take it and have a pr check it our and find your leak. Roy
COMMENT by , June 22, 2010
My 2003 Trailblazer is doing the samething. Did you ever figure out what was causing your problem?