A/C system blowing hot and cold in W210

[Rahulio1989300E]

Okay, so the W210 is getting kind of weird...

Driver's side vents blow very warm to hot air.... (temp set at 60F on Aircon)
Center vents blow nice cold air....
Passenger's side vents blow lukewarm to warm air... (temp set at 60F on Aircon)

I did a search, there was one hint that a low refrigerent level would cause this, but that was a theory....

The Volvo used to make a clicking sound all the time when it's refrigerent level was low, that was a safety switch clicking off and on the compressor so that it would not burn itself out from the lack of refrigerent.....

So far I do not hear this from the Benz....... Maybe a different design... but only 2 years apart... (1997 Volvo & 1999 MB)

I am really hoping that it is just low refrigerent... but that seems like too easy of a fix... it probably is something to do with the vent actuators or something right?

Yeah, this is going to suck.......

Any ideas? Should I get the system charge level checked? That seems like a good first step... What should it be charged to? (Give me a range!)