71 Cheyenne Forensic Heat A/C Rebuild

[FrankC]

Getting around to tackling my issues with heat and air this weekend and discovered the PO had removed or bypassed several key parts of the heat and A/C systems. It is factory installed air.

I am missing the Vacuum Reservoir and A/C Heater Valve for starters.

I have the location for the A/C Heater Valve and purchased a new one today.

I will be ordering a Vacuum tank, but need a picture of where it mounts on the firewall (if that is indeed where it goes). The hoses from the control were of course rotted, but push through a firewall grommet. (I assume the two hoses come out there.) One should go to the vacuum tank, the other would go to the A/C Actuator under the hood and it has a 't' to the heater control valve.

My control head vacuum switch has only 2 ports, not three. Was there a change in 71?

The vacuum canister should have another line that attaches to a source. The PO put a Holley Dominator manifold, so I will need to find a port there or on the base of the carb.

In the interior, should the passenger kick panel actuator have only the diaphram without a manual override like the driver's side? In otherwords, do factory air trucks have only an actuator on that side?

Final question: Anyone using Silicon based vacuum lines? Does anyone have a good source?

Thanks and sorry for the long post.

Frank