I have a 1985 Mercedes 190E with about 150,000 miles on it. The problem is with the climate control system - The air temperature from the vents remains the same no matter what temperature I set the dial to. If i set it to hot, it does not come out as hot as I would expect heated air too, set at cold, it is way to warm for Airconditioned air. It appears that all vent control work (I.E., middle vents, side vents, floor vents and defrost). I have read alot of threads on climate control problems and I found none that were described as this one. Any suggestions?