have a 97 deville, air works but doesnt come out the dash vents.
Classic sympton of a vacuum problem. Start at the source (don’t forget the check valve) any look for why the vacuum is not reaching points it should.
thank: SHOULD HAVE NOTED CHECKED ALL THE HOSES AND THE VACUME
Does cool air come out of other than the dash vents? If not how do you know it is working? Does you car have vacuum controlled vents? How about wire or electrical controls?
COLD AIR IS COMING UNDER THE DASH. I CAN FREEZE MY FEET. CHECKED THE WIRING AND THE VACUME AND LINES.
So vacuum is reaching the motors that control mode but the levers and doors are not moving,you have a jam in the linkages. Did you actualy measure how much vacuum is reaching these vacuum motors? your dash must be in pieces as it is not easy to get to these points.