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I plan on addressing the ubiquitous under-dash-vacuum-hiss in my 1977 F100 Custom (w/ AC). I have yet to tear into the dash on this truck for fear of disturbing dry-rotted plastic and PO wiring. As I think through the project, I would love feedback fromthose of you that have replaced the vacuum valve switch.
Ah...I am sure I have one of these too. It is easy to access, it's just on the backside of the environmental control panel. Remove the dash bezel (outer trim ring) and pull the panel (4 screws) that has the slider bars in it.
I had that vacuum hiss and I just disconnected the vacuum line where it entered and plugged it seems that that part is obsolete and out of stock were u able to find one ?
