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I have changed out the heater/AC Fan motor on a 1994 Pontiac Tran Sport if the 1991 is the same the motor is located on the firewall behind the engine. It's not hard to change out if you have a long extension for your socket wrench, there are four or five small bolts holding it to the firewall, and just two wires going to it, if yours doesn't have a disconnect you may have to cut the wires and then wire nut them to the new motor. Hope this helps.
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