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10-17-2002, 02:31 AM
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#1 |
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Registered User
Join Date: Mar 2002
Location: Dallas,Texas
Posts: 15
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a/c vaccum hoses
I'm fixing my heater and have come across problems with the vacuum hose routing. I found a diagram from a chassis manual on the board, but the vacuum switch on the selector has two nipples, whereas mine had three. Also the truck has no heater control valve, and the third port is plugged. Does that plugged port (far left when looking at it from the top) need to be routed to the valve, or is it always plugged?
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72 lwb 468/th400/3.73 2/4 drop primer |
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10-17-2002, 09:41 AM
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#2 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Trucks should have three ports on the control switch, one for vacuum source, one for air door on right kick panel, and one for outside air door on fire wall.
Jim |
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10-17-2002, 11:30 AM
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#3 |
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Registered User
Join Date: May 2002
Location: Knoxville, TN
Posts: 20
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Interesting...I have a 72 CS with factory AC, but I do not have a vacuum controlled flap at the RH kick panel, but rather a "standard" pull lever actuation. Similar to those seen on a non AC truck.
I've had the truck 7 years, but can't speak to before then. Did the 72 ever just do a standard RH vent? I do have the vacuum fresh air dump at the cowl and the vacuum heater shut off valve. Thoughts? Dave
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If James Dean had a truck, it would be a Cheyenne Super... |
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10-17-2002, 11:46 AM
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#4 |
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Registered User
Join Date: Mar 2002
Location: Dallas,Texas
Posts: 15
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As far as i know all a/c trucks had a vacuum actuated passenger side vent. I've seen some where a non-a/c manual actuator was added because the vacuum actuator died.
Jim, my system had a y in it for which runs both air doors off a single line, leaving me w/ an extra, unless it is for the heater control valve.
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72 lwb 468/th400/3.73 2/4 drop primer |
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