Pull the interior door handle open so you can reach the small square panel behind it.
Remove door panel 01 deville.
Open the door all the way and roll the window down completely.
Feel free to contact me with any questions.
It has nothing to do with the heat.
Otherwise the problem is in the heater control module where you turn on a c and the heat that panel has a.
Here is how to remove the front door panel on your deville.
Use a flat screwdriver to pop the panel off.
Position the window fully downward.
Ensure the manual lock knob 1 is in the unlock position.
Disconnect locking clip at front of manual lock knob by insertingsuitable flat bladed tool into top service notch.
Position window fully downward and ensure manual lock knob is in unlock position.
Remove manual lock knob.
Remove the phillips screw from behind the panel.
2000 2001 deville door panel removal.
Insert a flat bladed tool into the top service notch in order to disengage the locking clip 2 located at the front of the manual lock knob 1.
The a c fan should come on only when you turn a c on at the dash panel only.
If the heater blower fans don t come on then look in the main box fuse for a blown fuse also.