My a/c won't blow out the dash vents, only the floor vents in my 1994 Buick Regal GS.?

Question

Can somebody assist me with possibilities of why my air conditioning, nor my heater will blow through the vents in my car. The air will circulate form the blower vent on the floor, but it will not come through the vents. Can somebody please put me in the right direction. I've been told it may be the switch, but the switches work correctly.

Answer 1

This is most likely a broken vacuum supply line or plastic fitting somewhere in the motor compartement. If the vacuum supply back into the car is good to the controller, it will either be a problem inside the vacuum solenoids or the controller itself. At times I have seen something fall into the heater case, such as a pencil or pen, and this jams the doors so that they cannot operate. You will have to start diagnosis with vacuum supply. Good luck.

Answer 2

The switch only controls a vacuum valve that makes a diaphram push out or pull in. it should be easy enough to replace or you can jam it in the position you would like it. Look on the side of the floor vent you will see a round part with a bar sticking out of it connected to a peice going into the floor vent push or pull that bar in or out to where you want the air coming from and jam it. Or remove it and purchase a new one.... Good Luck

Answer 3

That flap inside the air box is actually vacuum operated. You either have a crack in the small plastic line that supplies vacuum to the flap actuator (vacuum line is near where the heater hoses go into the car) or the vacuum actuator that moves the flap is bad itself. Could also be a broken/cracked vacuum reservoir (follow the other end of the line)

Answer 4

i have a park ave. and i blows out where ever it feels like.
i think it`s a vacuum problem but i have yet to cure it.
hopefully someone will know more than i do and give you an answer