my 99 when you turn on the a/c or the heater, it only comes out the defrost. it don't matter what you turn it to, if its on, it comes out the windshield defrost and no where else. what do i gotta fix?

 

All of your deflectors are controlled by vacuum pots. You can remove your heater control assembly, and the vacuum lines from the position switch. Check for vacuum at one of the line with the engine running. Which one I do not know for sure. If there is no vacuum anywhere, there is a break in the line between the pump and switch. From there, it may be the switch itself. More than likely a break between the pump and switch.

 

Prolly just a vacuum line pulled off your pump. mine did it when i was in Gillette. we'll look at it tomorrow