SOURCE: ac will not blow thru ac vents, only thru defrost vents.
if vent doors are operated by vacuum check for loose or broken vacuum hoses in the engine compartment , or check the fuse box for any ac/heat fuses if it is a electricaly controoled system
SOURCE: 1999 f350 ac blows from defrost vents instead of ac vents
check for a vacuum line that has fallen off the diaphram vacuum "switch can" near the vent shift lever at the heater box under the dash passenger side
SOURCE: AC blows through defrost and floor vents instead of ac vents
You have a vacuum leak in the system that controls the vent doors. First check for cracks at the vacuum reservoir, then check the various vacuum hoses and vacuum motors for a leak.
Charlie
SOURCE: 2003 dodge durango front AC vents not working
had this trouble in a dakota it was a blend door in the heater unit. had to remove entire dash to repair
SOURCE: my ac only blows from defrost and floor
Look for vacuum leaks. System is designed to fail in defrost mode. so.... vac hose off, for example, would cause an issue like you describe.
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