I have aproblem where when i turn the control **** to MAX the air is dirverted to the floor and only slightly to the dash. The normal air control works fine. i would like the benefit of having much cooler and more powerful air coming from the dash and not the floor. has anyone experienced this problem?

 

Has anybody worked in the dash? Sounds like a vac leak in the dash or the vac control switch bad. If diesel maybe the vac pump.