Passionate about Mercedes, first car was a 1972, up graded to 1984 300D, 90's rolled around and had a blast with my 190E. The one thing I really missed was american/japenese cars had a nice feature on there A/C, you could open vents to allow air for circulation yet no blower to make you cold. always had a ruff time figuring AC and heat.
Well I moved up again, 95 S500. once again heating system frustrating me. I was sad to hear rear heat was not a standard option in this Highend Benz(who would have thought?) There is a vent in the back seat but for cool air only(i thought it was broke)manual confirms. Cold air is always blowing on your legs, the higher u turn blower to heat car the stronger that cold air gets! What i am wondering is when you change the Automatic heater valve you have a choice of parts one if you have rear heat and one with out rear heat. Is it possible to install automatic climate valve with rear heat and change/replace the vent covers with the heat dials on it? Or is it just toooo much work?