Cadillac: 86 cadillac heat, cadillac fleetwood, rear wheel drive

Question
Hello Tom, I have a 1986 cadillac fleetwood rear wheel drive. A while ago when I put the heat on the blower motor stoped working for the heat. There are 3 settings Low, auto and high. First the low and auto stoped working, then the high setting.Since then I would turn on the front defroster and heat would come through those vents. Today the defrost motor Stoped working. Any help would be very much appreciated.
Thank You,
Cold in New York


Answer
There is only 1 blower motor for the whole AC/Heater system.

90% of the time the fault is with the blower POWER MODULE which is located above the blower on top of the large black plastic housing and has 1 electrical plug with several wires connected to it and is held in place by 2 screws. Once removed you will see a large aluminum finned heat sink at the bottom of the power module.