bbbngowc

I can turn on my AC but I'm not getting any air thru the vents, only the vents at the top of the dash. Any ideas as to why the air isn't coming through the front vents?

mjr46

yes defrost is the default position when there is a vaccum source prob coming into the heater control panel... check the small black vaccum line entering the firewall by or around where the evaporator come through the firewall...either the line is broken out under the hood of the car or come off inside the dash at the panel or broke somewhere

onesickstang01

yea mine does this same thing, always wondered about it but never looked into it. seems like every older mustang i have had has this problem. anyone have pics of this or any other details?

AdderMk2

just gotta track down the broken vac line

scooterstang

definately a vac line. like said, check the blacktree on your passenger side by the firewall. I beleive the vac line is the one that runs across to the drivers side of the engine, but not positive

bbbngowc

The vac line going into the firewall on the drivers side, near the wiper motor is missing. Is this something I can buy?

onesickstang01

alright i checked my tree and i have two lines pulgged off. one marker b/r and then the a/c. what is the b/r port for and whereare these vaccuum lines supposed to run to? any info or pics would be great