I have a buddy working on a '57 Olds Super 88 (J2) heating system. Car is originally a non-AC car and he's trying to find a vacuum hose schematic/diagram to correctly get all the things on the control head connected.

Heater control head/unit has 4 pushbuttons, a heat control "slide" and a fan control ("high" or "low").

Looking for a good legible pic (or pics) from the factory Service or Assembly Manual to aid him in getting all the hoses hooked up.

Thanks