W124 Climate Control Buttons Quit
 

Recently my feet started to get cold in my '92 300 te. We then found that no matter which climate control button we pushed the heat would come out the defroster.

Sounds like a vacuum leak? Where best to start - and to continue...

Thanks.

Jersey jeff

Do a search!
 

Most likely, the ac flaps are not opening due to a broken vacuum pods under the dash. They are not that expensive but, the whole dash has to be removed. Big money if you pay somebody to do it. Big job if DIY but, "doable." I did it. A very common problem, unfortunately.
Good luck!