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Thread: 1st Gen Heater Core

  1. #21
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    OK, so everything is back together. I still can't get the fan to work via dash switch. I tried it with the new switch and the old one (old one works), and the new resistor. When ignition is turned to "On", and fan switch is turned to "On", I can fire the fan with a jumper from the battery to motor post. When either is in the "Off" position, the jumper does not fire the motor. So I think the connections are good. When I put the orange wire back on from the resistor assembly to the motor, the fan won't come on with either the new or old switch. :-(

    I'm sure I'm missing something simple, or the orange wire is bad, or the resistor wire(s) connector is dirty/bad. The fuse looks good. And if the fuse were bad, my jump wire tests wouldn't work???

    Anyway, when the Air lever is "On" plenty of air flows in over the core and provides lots of heat. Same with Defrost. If I was driving around in 20 degree weather maybe not, but why would I do that?? ha ha.

    I still have to install the inline hose valve to turn off the hot coolant flowing to the core when the weather is nice. I bought a cable ready one. Has anyone rigged up a cable for this? I guess I'll have to drill a hole in the dog house to install a cable knob like the one for the choke. Or maybe put the valve under the van near the core and run the cable up to the dash. That would be cool. No pun intended....

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    Last edited by VanSandy; 01-22-2020 at 05:49 PM.

  2. #22
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    1st Gen Heater Core

    For you to verify wiring...

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    Last edited by gfleduc; 01-22-2020 at 08:35 PM.

  3. #23
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    I dunno. Wiring looks all stock and I didn't change any of it. There is a blue, yellow, and orange (maybe it used to be red) coming off the top three prongs of the switch, and reconnecting at the corresponding three prongs of the resistor. Then another short orange wire coming off the resistor harness to the motor. The bottom fourth prong of the switch has a brown wire running to the fuse box. It is joined with a dark green wire (factory connector) then attaches to the fuse prong. Can't see where the dark green wire goes.

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    Thanks for the diagram, it matches the others I have seen.
    Last edited by VanSandy; 01-23-2020 at 12:01 AM.

  4. #24
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    Heater Wiring

    Did you confirm you have continuity between both ends of EACH wire?

    With everything on check voltage.
    a) 12 V into switch
    b) 12 V out of the switch
    b) 12 V into the resistor
    c) 12 V out of the resistor at the 14 BLK/ORN wire connector.
    Last edited by gfleduc; 01-23-2020 at 02:52 PM.
    Gary
    1965 Display

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