How does the climate control work in this vehicle? I followed this thread here Climate Switches - Benzworld.org - Mercedes-Benz Discussion Forum and it makes sense. Does this type of system not have a climate control computer to worry about? Can you heat the left of the car and cool the right, or does it simply close the vents off if the passenger selects a higher temperature when the driver has the aircon on - or what does it do (or rather what is it supposed to do)? Please advise exactly how this system works and what should be checked on it for proper operation. Thank you very much for your advice.