i have a 2001 mustang and when i turn the ac to max the air only blows out the defrost. not the vent. anyone have any ideas?only works on feet and defrost no vents work at all with ac on or off. and i cant seem to find any lines off. so what could it be[/align]

 

open up your hood and look at the back on the drivers side. there is a little tree thing that has like 4 hoses coming out of it. there should be a thin (1/2cm) black plastic hose coming out and going across to the other side of the engine bay. check that hose for any cracks anywhere.

 

Kinda sounds like a vacuum hose came off, or has a leak.

 

fixed