68 heat & a/c control

[wakeboardan]

Tonight I noticed a new issue in the Mustang. I have 3 controls that slide vertically on the dash to control defrost/heat/a/c. The 1st control seems useless, as I cannot get air out of any vents but the floor. Dash vents don't push anything, or the defrost. Could this be a bad switch?

 

[2+2GT]

Tonight I noticed a new issue in the Mustang. I have 3 controls that slide vertically on the dash to control defrost/heat/a/c. The 1st control seems useless, as I cannot get air out of any vents but the floor. Dash vents don't push anything, or the defrost. Could this be a bad switch?

Maybe, but I'd look at the vacuum hoses and vacuum motors that operate the system, first.