Wrecked my 95 C280 and just acquired a 99 C280 as a replacement.

Lots of stuff is quite different. Found so-far changes/improvements to: engine, vacuum setup, and HVAC system.

Currently, I have 2 component questions:

1. HVAC. How do the HVAC module work on this car? I can only get the selector arrows for upper, lower and upper/lower.
I can NOT get the selector on center vents.
Is my unit broken? Does the middle vent produce warm air ever??

2. CAN system. Does this car have a CAN system? How can I tell if its installed?
Radio installed is a Becker 3309 (CAN compatible) and doesnt illuminate with the dash lights.
Contacted Becker and they say this is NOT OEM installed and will NOT illuminate due to lack of CAN in 99 model.
Becker instructs that car was manufactured with the BE-3302 unit.

Anyone knows if Becker is correct? Or do I just have a busted LED display?
BTW, the BE-3309 unit works otherwise and gives excellent sound for OEM.