'91 560SEL Climate Control Bi-Level malfunction
 

I noticed today that when the ACC is set to either Normal or Bi-Level, it appears that cool air is always directed as Bi-Level, meaning most of the cool air is directed to the windshield, and very little cool air is directed to the center outlets. The side outlets and the rear outlet appear to blow cool air just fine with either Normal or Bi-Level setting. Anyone experianced this before? Any tips would be appreciated.

thx,
emmy