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1991 Cadillac DeVille Blower Motor


V. Fisher's Avatar
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04-03-02, 05:07 PM   #1  
V. Fisher
1991 Cadillac DeVille Blower Motor

My original question was about a heater fan that stayed on even after the ignition was turned off. Wiring was traced and disconnected. The suggestion was a stuck fan relay however this model (DeVille Sedan, 4.9 L engine) has no relay in the circuit for the blower motor. Any other info. on how to troubleshoot the circuit???

 
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04-03-02, 08:06 PM   #2  
Joe_F
Please use your reply button to keep all posts together on the same subject for clarity and continuity.

That being said, time for a wiring diagram. Check the links in my signature file and if not, to www.alldata.com for a subscription and factory diagnosis procedures. 25 bucks well spent.

 
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04-03-02, 10:03 PM   #3  
knuckles
Your Cadillac has an electronic climate control system with a blower control module. The blower control modules often fail in the ON position. Get a new AC-Delco blower control module...they're actually cheaper than most aftermarket units.

You might also want to check to see if this car was ever fitted with an "afterblow" module. The afterblow module was designed to run the blower motor for a few minutes after the engine is turned off in order to dry the a/c evaporator and prevent mold/mildew growth. A shorted afterblow module could cause the blower motor to run all the time.

 
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