I have a new 65 C20 and I have been doing things to make it better. I installed a new fuse box and finally got the fan working. It then occurred to me that there is no heater control! There is an air/fan knob and the up down control toggle on the heater. The hoses in and out of the heater box on the firewall are both hot when running. I had a C10 in high school. I distinctly remember there being heat and a way to control it... sorta.
here are a couple of shots of my controls.
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