2005 DeVille Climate Control will not work

I think your climate control unit is fine. It's just your blower motor. If you know where the blower motor is, turn the fan to high and rap the bottom of the motor with a heavy ratchet. Usually it will come back to life. It will only last a day or two. You will need to replace the blower motor. Here's a video that shows where the motor is located. If you lose a speed or two, it's the resistor which is featured in the video...... https://www.youtube.com/watch?v=PgTMO36iakc