SPDUDETTE, read this
Dude, im beinning to think you dont have an AC in your car LOL, i was just kidding, listen, if u have a benz and its new there has to be a dial to the left that has 0 at the bottom of the dial and you turn it from from left to right, when your reach as much right as possible then your would have reached the 0, its not numberd,just 0 is the only number there, there has to be 2 round nobs at the bottom of the AC controls, one is on the left and one is on the right, the left is what i was refering to, the right is to control how the air comes out from for example if its going to be from top vents, bottom vents, etc. now if still u cant find it please take a pic of your control unit and posted so i can take a look at it and help you ok