1977 hvac issue

[David B.]

the heat and air is only coming out from the floor ducts. no air is coming out of the other vents or the defrost.

[Edward J.]

Re: 1977 hvac issue

David sounds like a vacuum hose under the hood may have been disconnected or feel off. this system operates on vacuum.

[Joe L.]

Re: 1977 hvac issue

the heat and air is only coming out from the floor ducts. no air is coming out of the other vents or the defrost.

David------


In addition, it could also be caused by failure of one of the system's vacuum actuators or the rotary switches in the system controller in the forward console.

[David B.]

Re: 1977 hvac issue

thanks, I will look into those suggestions. how many actuators are there and where are they located?

[Joe L.]

Re: 1977 hvac issue

thanks, I will look into those suggestions. how many actuators are there and where are they located?

David------

The actuators are located underdash on the heater box. I believe there are 2.