1999 gmc savana a/c problemthe a/c only partialy blows from the dash have checked...

[carpetweb]

...all vac lines from switch? when i turn on the a/c it starts out blowing out heater vents after a bit it will go to dash but not completely...all vac lines are connected from switch to blower doors.....any ideas
i'm pretty sure its a vaccum problem......just not sure where i'm loosing it......
i'm pretty sure its a vaccum problem......just not sure where i'm loosing it......

 

[marvin_g_33334]

The Savana has a Vacuum Canister under the hood-either it's cracked or the lines going to it ,or the line @ the engine.Probably when U accelerate it blows on the floor THEN when U are cruising it goes to the dash until U accelerate again.A vac problem 4 sure.