If you have the same controls as a 97, there is only one bulb and that is for night viewing. When you are in normal mode, is the right side visible?

As long as the compressor stays engaged after 10 min, the most likely cause is a expansion valve sticking closed. My 97 SL320 was like that. The valve can stick open freezing the evaporator but air flow will also drop.

The next possibility is the variable displacement compressor going to minimum displacement.