» » »

Dodge Q&A

Ask Your Question

2004 Dodge Ram 2500 Question: what causes the ac vents to change from floor to panel and back by themselves

 

Question

skyhawk11, 5.9L 6 Cylinder Diesel Turbo, Potwin, KS, May 12, 2014, 15:22
 Rookie

with ac/heater running

1 Answer
Flag This
  • Answer #1

    Mobile Tek May 13, 2014, 03:04
     Enthusiast

    If vents are controlled by vacuum a loss of vacuum would cause servos to go to a rest position and usually air only comes out of floor and defrost vents. Diesel engines need a vacuum pump because they unlike a gas engine have no or very little vacuum.

    Flag This
  • Reply

    skyhawk11, May 13, 2014, 07:41
     Rookie

    do you know if there is more than 1 vacuum check valve,in the system

    Reply
    Flag This