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Q: 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
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