Here I go again I have a 1990 cadillac deville i followed the advice i received i took a jumper wire to the heater blower motor and it works ,the next tip a got was to replace the blower module(relay) i replaced it and still no luck any advice will be appreciated.

Usually they are located behind the glove box.

Electronic climate control power module . Don't know what relay you replaced because this vehicle has no blower motor relay . 1990 Cadillac DeVille Power Module

Here's a link to what your blower motor resistor look's like,it's next to the blower motor,2 screws hold it on.Blower Motor location can change from year to year. It can change with the trim level of the vehicle. A vehicle that has front and rear climate controls may be configured differently than a vehicle that has front controls only. The following are two different repair procedures. One is given because the blower motor is located and accessed in the engine compartment, the other is given because the blower motor is mounted inside the vehicle. http://www.autozone.com/cooling-heating-and-climate-control/blower-motor-resistor/duralast-blower-motor-resistor/cadillac/deville/1990/8-cylinders-3-4-5l-fi/860043_0_0 Here's a link to your blower motor. GET 35 GIFT CARD FOR EVERY 100 SPENT ON ONLINE SHIP TO HOME ORDERS

Under the right dash. It should be the second one from the left, on the bottom.

Hey Jeff,you did check fuse in fuse box on driver side,if good and secure,then it may be your blower motor resister,it's located by blower motor,controls the blower motor,if bad it won't run or just on some speeds,if part doesn't fix,Autozone will refund.You can't tell by looking at resister to see if bad.Here's a link to the blower motor resistor,

Bypass high/low pressure switch in low side line harness with jumper to engage compressor and check.

Your blower motor operates off a heater blower module. If you can take a wire and jump it to your heater blower motor and see if that operates its it your module is bad instead. The module is located on the top of your a/c evaporator case near the wiper area

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

replace blower control module

There's a blower motor (fan) under the hood and up against the firewall near the center of the car that takes some work to remove. It has gone out in the last 2 of my 4 Cadillacs. Turns out if you're not real careful with the positioning of the spark plug wires they will brush up against it, and if one of them gets cracked or brittle it will "arc" and short out the blower motor. The a/c compressor should still come on (you'll hear a click when it engages) but you won't get any air blowing into the cabin, hot or cold.

The part was like $200 stock (year 2000 prices) and it took about an hour to remove it. My Caddy at that time had this damn strut bar going across the engine bay which we eventually removed to get to the blower motor.