Re: Dash knob layout?
In my 64 1500, the hole to the left of the ignition is empty. My heater control is a knob located to the right of the radio that is pulled out for more heat and turned to control the fan. I don't like this arrangement because the knob is a hazard, especially when pulled out. And unless held just right, the knob comes off when pulled. My guess is that the cable behind your "Heater" knob has been re-routed from the original heater control. If so, this is a good idea for me to look into as well, although the fan control function can't be moved.
JRMunn
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