Vacuum Problems ???

G'Morning....my AC switches from dash vents to defrost when under a load or during hard acceleration. Does anyone have an idea on what is causing this and how to fix....Thanks.

it could be a bad vac. switch, or a cracked vac. line, and I think I remember reading something about a TSB about installing a redesigned check valve in the vac line that goes to the switch or something like that. I'll look around and see if I can find more info on that TSB.

it could be a bad vac. switch, or a cracked vac. line, and I think I remember reading something about a TSB about installing a redesigned check valve in the vac line that goes to the switch or something like that. I'll look around and see if I can find more info on that TSB.


I found it...TSB 24-01-96 Rev. A. Thanks.

Not sure if you are still having the vac. problem, but I just joined the group. Your problem is the vac. check valve comming off of the manifold line. It costs $4.00 at the Dodge dealer, takes 30 seconds to install.