need A/C vacuum diagram

[John H III]

My 99 blows out of the vents while at idle or stopped but when under load it starts to blow out of defrost vents. I know its a vacuum leak but don't know if behind dash or somwhere under hood. only thing that has changed is transmission was rebuilt a week ago,before that it was fine. Any suggestions

 

[Wicked_Sludge]

sounds like the infamous "blend door" issue. search around a little, lots of info on the subject...

 

[John H III]

Fixed

The vacuum actuator for the front hub was leaking,bypassed it & a/c works fine. Already locked the hubs so don't need tha vacuum anyway

 

[maskale]

where is the actuator, I am having the same problem. what exactly did you do?

 

[John H III]

on passanger side.down around coolant reservoir,my vacuum hubs went to it. to bypass it get some vacuum T's and bypass