Mechanics

A/C

1998 Dodge Ram • 130,000 miles

When you turn the ac knob on, the ac works but you cannot change the air flow from the defrost position to make the air comes out the vents. The knob will turn but the air flow is not redirected.
what needs to be checked and if it is a vaccum problem how would you know/
Avatar
Footmeister1
June 25, 2013.



Vacuum does control Mode either switch is faulty or Vacuum source from engine intake was lost. Black plastic line from intake through bulkhead to switch

Docfixit
Jun 25, 2013.