Quote:
Originally Posted by sventinker
In my 70 no a/c c10 my father in law added the factory style a/c heat controls and none of the cables line up with the new control. So I want to learn what the cables do so I can figure out how to rig it for heat and or defrost this winter. Would a heat only truck have 2 or three cables? would it have a shut off valve in the line feeding the heater core? Is my stock fan motor 1 speed? or does it vary based on resistors? The fan control I have now has multiple positions.
I know its a lot of questions but I don't know anyone with one of these trucks I hope you guys can help thanks.
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3 cables. No valves in the lines. A diverter door controls whether air goes through the heater core or not.
Here are a couple of pictures. The top cable on the control goes to the front control arm, the middle one goes behind the heater box and to the bottom, and the bottom one goes around the heater box and into the heater box by the firewall.
The third picture is the blower motor resistor. It's located on top of the interior heater box on the right side. They can be pretty fragile so use a small screwdriver to gently pry the connector off if the terminals. I think the blower motor is basically a single speed motor and the resistor controls the low and medium speeds. High is a direct 12 volts. The switch is on the side of the heater control panel and the middle lever controls it. You can see the switch in the first picture where the connector is.
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