2004 GMC Envoy XL

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I have a 2004 Envoy Xl and the rear a.c. is not working. I am guessing it is a fuse that has blown. I know where the fuse box is, but which one is it? I bought my Envoy in Kingsland, Ga. at the dealership and Derrick was the salesman and he never gave me a owner's manual, even though he promised one to me and after many attempts to get one from him, he changed jobs, so I am manualless. HELP my kids say it is hot back there.