Question about 1992 Cadillac DeVille

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1992 cadillac deville changed a/c compressor, a/c heater blower and a/c heater controll panel. checked all the fuses. the blower will not come on. were would the relay be located?

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  • lshadell1971 Aug 04, 2010

    or what can cause the blower not to work even on defrost

  • lshadell1971 Aug 04, 2010

    did not change blower motor resister module. could this solve the problem on the 1992 cadillic deville and is there a relay for it?

  • lshadell1971 Aug 04, 2010

    thank's for the help

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The hear fan motor in Cadillacs after 1993 are controlled by a speed controller. This is an electronic device that changes the speed of the motor based on a series of electronic pulses sent to the motor by a computer. The speed controller is a round circuit card located in the fan motor itself. They do not use a blower motor relay on this car. What they do is use something called a power module that controls the speeds. What happens is it goes bad due to high blower motor amperage requirements and then the blower motor and module need to be replaced as a pair. It is located under the hood on the passenger side in the evaporator core module. It has a 5 wire connector with a long black wire comming from it. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Aug 04, 2010

  • raj somaiya
    raj somaiya Aug 04, 2010

    There is no relay and replacing blower motor resistor should help resolving the problem.thanks for keeping updated with your query.

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Did you replace the blower motor speed control module? if it failes the blower will not get any power, it is located right next to the blower and is held on by a couple of screws, see picture and part number below

AIRTEX / WELLS Part # 4P1403 BLOWER MOTOR RESISTOR MODULE
$135.00

1992 cadillac deville changed a/c - b4a7085.jpg

Posted on Aug 04, 2010

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As I stated my 1992 Cadi Deville a/c and heater control is says on the Hi poition and if you hit Low it will not change at all. I have replaced the climet control panel and it remains the same. I checked...


fan for heater /ac is supposed to run any time the ignition is on something about cabin pressure . cadallics better idea but used by most makers now

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I have a 1992 cadillac deville that the heater blower motor will not turn off when I turn the key off. It just stays on without the key being turned on.


There is obviosly a short some place. A temporary fix until the short can be traced is to remove the heater fuse. Locate the fuse panel. It is usually under the dash on the driver side but has been known to be on the right hand side under the dash or maybe even in the glove compartment. Once you found it then read the cover and locate the heater fuse. Remove t and save the fuse to replace at a later date.If the heater fuse operates more thenone feature such as windshield wipers or radio and so onthen you will need to leave the fuse in if you want the other features. Another option is to remove the negative battery cable when the vehicle is not in use to prevent the battery from being drained. I hope this helps, The Raz

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make a jumper cable up from lamp cord (from any Hardware store) and power up the blower motor from the battery

Jan 18, 2010 | 1999 Cadillac DeVille

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Blower motor will not come on. the climate controller come on. all fuses are good. new blower motor. I have a 92 cadillac deville. I need a good diagram


this has a "power module" near the blower motor, this is what control the blower motor to come on. very common for this power module to fail.

Oct 13, 2009 | 1992 Cadillac DeVille

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It has a blower control module instead of a resistor mounted in the box next to the blower motor. The blower control module is bad

May 19, 2009 | 1992 Cadillac DeVille

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