ventilation system
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From: KCMO
ventilation system
ventilation system
I just purchased a 1978 F150 and the ventilations system does not work properly.
The switch that controls the air flow to different areas (hi-lo, vents, etc...) does not work in that the air never moves from coming out of the defrost vents no matter where the switch is moved to.
What would cause this? bad switch? no vacumn? vacumn motors not working?
I have checked a lot of the vacumn lines and the rubber appears to be good.
How does the motor create the vacumn in order for the system to work? Could this system, whatever it is, be the culprit?
I've also noticed in Chilton's there are two motors in the lines, one for heat and I think the other is for defrost?
The truck is very sound and in good shape, but needs attention w/ weatherstripping, and other seals.
I just purchased a 1978 F150 and the ventilations system does not work properly.
The switch that controls the air flow to different areas (hi-lo, vents, etc...) does not work in that the air never moves from coming out of the defrost vents no matter where the switch is moved to.
What would cause this? bad switch? no vacumn? vacumn motors not working?
I have checked a lot of the vacumn lines and the rubber appears to be good.
How does the motor create the vacumn in order for the system to work? Could this system, whatever it is, be the culprit?
I've also noticed in Chilton's there are two motors in the lines, one for heat and I think the other is for defrost?
The truck is very sound and in good shape, but needs attention w/ weatherstripping, and other seals.
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Joined: Jan 2008
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ventilation system
Howdy & Welcome to FTE
The Vacuum is supplied by the engine.
It's the same vacuum that sucks air into the combustion chamber.
There should be a vacuum reservoir on the system so the A/C, cruise control does not drain the system with their use.
Usually there is a nipple or vacuum tree on the intake that the A/C unit is hooked to.
I might just send this thread to the heating Air conditioning forum
The Vacuum is supplied by the engine.
It's the same vacuum that sucks air into the combustion chamber.
There should be a vacuum reservoir on the system so the A/C, cruise control does not drain the system with their use.
Usually there is a nipple or vacuum tree on the intake that the A/C unit is hooked to.
I might just send this thread to the heating Air conditioning forum
