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Cadillac Repair/Interior Vent Fans Stay On

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Expert: - 7/25/2009


Question
Rob,

When I turn off the ignition and pull the key the fans still blow air continuously.  I didn't want it to kill the battery, so I pulled the fuse under the hood.

At an auto part store today, they told me to buy and try a new relay.  But that didn't work.  

I saw an earlier post you said you could bypass it and it would stay on high.  That would be fine with me until I can get a more permanent solution.

Thank you for your help.

--Cain
'92 Cadillac Sedan Deville

Answer
Hello,

You appear to have the same problem many Cadillac owners have had since the early 80's in which the blower resistor module malfunctions.

You can pick up a toggle switch at a parts store. You can hook one side of the switch with ignition power. run the other side of the wire under the hood. If you drill a hole through the firewall, use a rubber grommet in the hole you run the wire through. Should be 10 or 12 gauge. Install an inline fuse holder with 20 amp fuse. Run the remaining wire to the blower. The reason you use switched power is so you don't forget to shut it off and have the battery go dead.

Rob

Cadillac Repair

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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.

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