A/C blows only out defrost on c class E450 ford
The air cond. only blows out the defrost.WHY?
Forum Discussion
Vacuum line or a bad vacuum valve. Vacuum valve pulls a flapper door to switch between defrost or dash vents. Could also be a jammed flapper. Leave, etc. My Jeep had a broken arm on the flapper. Had to take the dang dash apart to get to it.
