1998 Chevrolet Venture Q&A

1998 Chevrolet Venture Question: all of sudden my air flow stop on windshield glass

all of sudden my air flow stop on windshield glass so i can't drive in rain. if i block (close)all vent then i get very low air flow in windshield. how can i fix it -
Answer 1
Check for any broken vacume lines that supply vacume to HVAC controls. Vacume is supplied from engine intake manifold. -
Comment 1
thanks a lot -
Answer 2
Sounds like selector switch not switching, will it switch from vent to floor and back? Anything fallen into defrost vent? Check ebay for control panel at a good price, if needed. No vacuum defalt should be defrost! -
Comment 1
thanks a lot -