You are here:

Cadillac Repair/Electrical problems

Advertisement

Expert: - 12/6/2009


Question
the heater blower motor runs all the time with or without the ing. turned on, useing the heater control switch has now effect on this problem at all can you help? thankx This is a 92 Cadilac STS

Answer
Hello,

One of Cadillac's VERY common problems over the past 20 years. Can cost well over $500 to fix or more at the dealer. If you buy a module at the junk yard, it will be junk now or in the future.

Disconnect neg battery cable--

This is a slip shod fix, but saw it on many vehicles and just a suggestion--Cut the power wire going to the blower motor. On the wire going to the motor, install a 10' piece of 12 gauge wire. Run the wire through the firewall. Connect to toggle. Take another 10' piece of wire and connect to other side of toggle. Run through firewall and attack it to the other end you cut.
Reattach neg cable.

This way, the circuit is still fused. You will only have high speed, but it is better than nothing at all.
Flip the switch to have high blower, and flip the switch the other way to shut it off.

Cadillac Repair

All Answers

Answers by Expert:

Ask Experts

Volunteer

Rob Painter

Expertise

Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?

Experience

Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

©2012 About.com, a part of The New York Times Company. All rights reserved.