[Stocker]

Originally Posted by Casper42

ironically, my water value has been removed, making it a manual adjustment in the engine compartment to close off the hot water flow (North Carolina truck until recently). Are you suggesting the "vacuum line" to be a metal tubular line that was covered by this rubber sheath that went thru the firewall at the location shown in the picture?

No, my vacuum line is a small rubber hose that comes through the dash in the same place you have pictured. No metal line there. I believe it comes directly from the A/C controls on the dash.