2002 Cadillac Deville Deville HVAC Aircondition Cold passen

The airflow starting immediately, I do not think is a problem. The temperature difference could be. On a more specific level, is the passenger side and drivers side being set to cold, and only cool, or ambient air exiting the drivers vents? When heat is selected, is the heat adequate out of both sides? In certain situations, a low refrigerant charge can give cool air on the passenger side, and not as cool air on the drivers side, it has to do with proximity to the evap core. Another situation could be a fault with an hvac actuator. You can enter diagnostics and check for trouble codes from your info center buttons. Push and hold info up, and on/off until the segments light, and release. It will display ALL, push on/off again and it should read ALL CODES, and push on/off again and record all codes. They will sequentially display in alphabetical order, by module. Record them and post in a reply. More specifically, I believe we are looking for IPM(instrument panel module) codes. If you have an actuator type fault, it should set a code. A lower than capacity refrigerant charge will not, in most cases. If the charge gets low enough to inhibit operation, it may set a code, earlier models did.

None of the codes pertain to your symptoms, I will inform you on what they are. The C0660 in the RIM is a fault relating with the exhaust solenoid in the level ride compressor, the level ride is probably inoperative due to this condition. The C1287 in the ABS relates to a steering position sensor fault. Often times it is the sensor, but not always. The U1713 set in the drivers door module is a communication fault, in respect the system disables express up as a result. The U1064 is a communicatios fault as well.

So when you say you tried hot/cold combinations, does the driver side continue to just blow ambient air at all times, and the passenger changes respectively? Or does the driver side just not blow as cold as the driver side?

When set to full hot, it will stop blowing out the vents, and move to floor. In auto mode, it will change modes readily based on inside car temperature. If it is 60 in the car, and you set to 75-80, it may blow out floor vents. The problem I would focus on, is the fact that it doesn't blow cold out both sides. If you are getting some cooling, close to or lower than ambient, I would make sure that you have a full refrigerant charge in the a/c system. This can cause some temp difference side to side, and the warmer it is out/inside, the more difference you will notice.

It is almost safe to say you are at the point of needing a scan tool to check a few things. Actuator commands, versus actual positions. Usually if an actuator overtravels, which is most common, it defaults to a position(hot or cold). When this happens, it should set a code, and this code will also be stored in a history. If there is a mechanical type problem, say linkage that is disconnected for example, the actuator will respond to commands, and a fault may go unnoticed. It could possibly be something taken care of through software programming, it is hard to say. Try this recalibration procedure.

Calibration Procedure without a Scan Tool
Turn OFF the ignition.
Remove the battery positive voltage circuit fuse of the Instrument Panel Control Module.
Important: The module memory will not clear if the battery positive voltage circuit fuse is installed in less than 60 seconds.

Wait 60 seconds.
Install the fuse.

The fuse indicated is the HVAC fuse in the rear fuse block, under the rear seat LH side.