I am the new owner of a 94 e420 w/ 93K. When test driving the car before purchase, I noticed the climate control didn't seem to work right..when set at 72 degrees or so, the fan would kick in full blast, but not slow down after the interior warmed up..I would have to manually switch it to the low fan setting. Is this the interior temperature sensor not working? anything else? I was told that Mercedes has a plug in diagnostic tool for this climate control, and that they could tell right away. The car is under a warranty, and I'd like to get it fixed.