Thank you doc j, I finally figured out how to perform my onboard diagnosis on my 2000 Cadi Deville
So here are the CURRENT CODES that were retrieved by doing this....
RIM=C0660=Level Control Exhaust Valve Circuit MalfunctionI
IPM=B0423=Air Mix Door #2 Inoperative Error
B0429=Temperature Control #3 Rear Circuit Range/Performance
B0249=Heater/Defrost/AC Door Range Error
Now that I have these codes, I am aware that I have more issues then just my air not blowing out of my vents, but to solve one problem at a time due to the fact that I live in Texas and it's starting to get really hot....Which one of these codes is directing me to this issue...
Air comes on but does not blow out of center vents, only on floor and defrost vents
Clicking noise behind the radio that last for about 10-15 seconds and then stops
Cool air on driver side, no cold air on passenger side