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I had the factory AC box, but the heater core had blown long before I got the truck and filled everything with rust, the AC compressor was long gone too. I gutted it out when I rewired the cab, since literally nothing worked.
My buddy had a Flexalite heater he hooked me up with for X-mas (he bought it about a week before he Jeep got totalled by a drunk driver), so very soon I will have heat and defrost, for the first time since I got the truck almost 2 years ago!