1996 Jeep Cherokee electrical

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We recently took our Jeep to the dealership because it wouldn't start 6 out of 7 tries. It was the power train control module, which was replaced. Turned on the AC on the way home, blew hot air. Took it to dealer for AC service. Dealer said the AC had burnt out half the control module, which was replaced at no charge. Jeep in the shop for a week -- replaced some cracked wiring and connectors but said they couldn't repair the AC because the wiring was too old. $1200 total gone, and no AC and the after-market window controls don't work. It's 104* in Tucson today. HELP!!!