Question about 1986 Cadillac DeVille

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The heater fan is blowing even when the car is turned off. 1986 cadillac coupe deville

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Replce the power module located under hood on pass side of hvac case two screws one ground wire and one connector

Posted on Aug 25, 2010

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Posted on Jan 02, 2017

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Can a 3800 series 2 v6 replace a ht4100 v8 in a 1986 coupe deville?


Sub frame , wires, computer, BCM are all different. A 4.5 or 4.9 engine will fit if you use your intake and gaskets for a 4100.

Mar 29, 2011 | 1986 Cadillac DeVille

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1992 Cadillac Coupe Deville blower fan runs all the time


The BLOWER MODULE is located on the A/C EVAPORATOR housing located UNDER THE HOOD passenger side firewall. Has 2 electrical connectors. Mounted with 4 screw bolts.Hope this helps

May 20, 2009 | 1988 Cadillac Sedan DeVille

1 Answer

Ignition switch repair


The switch is on top of the steering column just behind the lower dash panel. Undo lower panel remove the steering column bolts upper and lower. Drop column and you will see it. The lock cylinder is a whole other story that will require special tools. Especially with a tilt and telescopic column.

Apr 10, 2009 | 1986 Cadillac DeVille

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Heater fan


First check the fuses, all the fuses it maybe hook to something else always check them all. If OK check to see if you have power to the blower motor by unconnected the plug-in and hooking a test light to a good ground on the car and putting on each terminal of the lead going to the motor when the key is on. one of them should turn the light on. if it does then your going to need a blower motor most likely.

Nov 10, 2008 | 1986 Cadillac DeVille

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