Blower motor control module , maybe. The HVAC control panel sends a PWM - pulse width modulation control .
HVAC Blower Motor Circuit http://www.bbbind.com/free-tsb free wiring diagrams . Enter vehicle info. year , make , model an engine . Under system click on HVAC ,then under subsystem click on HVAC controls . Click the search button , then the second blue link . Blower motor control diagram . Suggest you take it to a qualified repair shop if you don't know how to diagnose electrical systems on automobiles
SOURCE: 1999 Caddy Deville A/C problem
A/C systems are hard to diagnose without having access to the vehicle. One of the most common problems is undercharge (Not enough freon in the system) indicating a leak somewhere in the system. Other causes could be a burnt A/C compressor clutch fuse, defective compressor clutch, defective compressor/belt, defective High/Low pressure switches in the system, defective evaporator icing switch, defective wiring... Basically, you're better off getting the system diagnosed by a good A/C knowledgeable mechanic...
SOURCE: 92 cAdillac sedan deville problems after cd player installation
You probably could but your gonna spend ALOT of money,what I would do is un install the cd player and check the wires.Undo everything you did back to the way it was before. Sounds to me like you have crossed wired or grounded something. If this fixes your problem take it to a car stereo place that installs radios and pay them to install your CD player.
SOURCE: 1999 cadillac deville air wont work
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.
SOURCE: Cold AC but weak Airflow---Also Driver side not as cold as passenger
The air doors are controlled by actuators that on of them or so may need replacing.
SOURCE: Blower fan does not shut off and AC does not blow cold on MAX
It seems the AC switch is faulty maybe it doesn't contact the compressor wire on the MAX.
Check the switch.
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