stock 81 camaro A/C problems

[1981silverz28]

my 81 Z still has the factory A/C and has worked good until recently . The selector that controls wether it blows in the floor or defroster or dash doesn't change . I don't know what oprerates the door that routes the air to the different vents but I've heard it was controlled by vaccume. Any ideas on what could be the problem . I would rather ask and it be a simple solution as me tear the dash apart and then find out it could have been fixed without having to do that .

[Twentyover]

Most mode controls for GM HVACs were vacuum controlled in the 70s and 80s. Most common problems would be a cracked vacuum hose or vacuum diaphragm in the mode door actuator

[PARKERRS]

Like Twentyover said, this is all vacuum controlled on the '81. It could be the vacuum selector on the control itself leaking, a bad vacuum line or the diaphram at the heater box. It's more or less a search and destroy kinda project, you'll have to test each component. A hand vacuum pump with a gauge is your friend here.

[1981silverz28]

Thanks guys . I will start my searh and destroy mission tonight or tom hight . And then order pats for the one that I break the next day

[1981silverz28]

I just fooled with the little cacuum canister on the firewall and found the hose was pulled loose from the firewall ,pushed it back in and it works perfect . Dang I feel stupid

[yellow1098Greg]

Those the best fixes ever! haha congrates