cant get the air to come out of the defrost vent ...wondering what makes it switch under there......

 

Vacuum does the work through actuators, could have a binding door in your plenum. As a "safety" thing in the event you lose vacuum, air is supposed to be routed to the windshield by default for fog control.


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Also the "vacuum manifold" that connects to the back of your HVAC control dries out and can wreak havoc on it's operation.


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thanks alot ...i will give it a good look

 

Just take your glove box out and take a look at what goes on behind it. Like tower ofpower said everything is vaccum so you might just have a leak or break in one of the lines.

 

You should have bought a ford if you wanted this sort of stuff to work dodge kinda sucks in that department