Mechanics

THE AUTOMATIC TEMPERATURE CONTROL BLOWER MOTOR RUNS CONTINUOUSLY EVEN WITH THE IGNITION SWITCH OFF.

1993 Cadillac Deville • 160,000 miles

The blower will not shut off unless the fuse or the electrical plug to the blower is removed. The motor is on the firewall under the hood. The A/C works but the fan control has no effect. The same speed all the time and will not shut off even when the ignition is off.
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Cmsgtsmith
March 4, 2012.



Check the EEC power module, located at rear right of engine compartment. Seems it is supplying power to the motor all the time.

KHLow2008
Mar 4, 2012.
For any ones information the problem was with the blower resistor power module. The cost varies from locally at $215 dollars to $124 on the internet for new units. The junk yards varied from $25 to 75 dollars. The module is located on the air intake under the hood near the blower motor. You must remove the cover for the firewall fuses. Then remove the 2 screws on each end of the fuse and relay holder. The nut on the right side is hard to see and the plastic flange of the fuse holder will have to be pried back slightly in order to get the socket on it. When nuts are removed pull the fuse holder back toward the front of the car a few inches and expose the air chamber. You will see two electrical connectors. Remove them, they have a plastic lock key that must be removed. Then remove the 3 screws in the head of the module and pull it up and out and replace it. Installation is the reverse of the removal It' not that difficult and you will save many bucks over what the dealership will charge. Have fun, my unit worked great and cost me a total of $25.

Tiny
Cmsgtsmith
Mar 30, 2012.
Thank you for the feedback and input.

Have a great day.

KHLow2008
Mar 31, 2012.