I have a 91 Park Avenue Ultra with problems with the environmental control module.. Where is this sucker located. The Chilton type books do not give this information.

under the dash on the passenger side. Should have 2 sets of wires pluged in on one end and one set on the opposite end. Remove the access panel under the dash on passenger side. Should be able to pull down the module and then using a nail or philips screwdriver, push in and up on those wire brackets to get past the safety latch thing they have. Just need to push into the "lock" mechanism enough to allow you to pull the wire set out.