On my 330d 81 and my 240d 82 lets cold air vent out through the 2 center air vents on the dash just above the climate control, the 2 side vents and the defrost vent. My 300cd only vents from the side and the defrost vents when the a/c is on. I've had it for 2 yrs and thought it was suppose to be that way. With so many of you 300cd owners out there I thought I'd ask, does yours vent from the 2 center vents. If it does which button would control that on the climate control. Which button stops it from venting at the defrost vent. It might help me chase down a problem easier if I have One. Thanks ahead for any help you can give. I put an attachment that shows my climate control to help out.

RAY M