allof a sudden my a/c stopped blowing out my front vents will blow out the defrost and the floor but not the front ducts anybody ever have this problem? thx in advance Hop Sing

 

Sounds like you have a vacum leak, the controls are operated by vacum. A vacum line comes thru the firewall by the heater core, trace from there to the vacum pump and if you dont find a leak it must be under the dash or in the controls themselves.

 

thanks i will take a look

 

ya thats a vaccum leak, there is one main line that runs along the firewall into the cab, start with that one

 

Yea I just ran into this issue today, after I replaced my Lift pump must have pulled a vaccum line..

 

had same problem came undown right where it goes through the firewall it is tough to get to