‘70 non-A/C heater control unit

Discussion in 'Troubleshooting & Diagnosis' started by flidoug, Dec 15, 2017.

  1. flidoug

    flidoug Member Gold Member

    77
    1
    Jul 28, 2007
    Panama City Bch., Fl.
    How do I bench test the fan switch on a ‘70 camaro non A/C heater control unit?
     
  2. Gary S

    Gary S Administrator Lifetime Gold Member

    21,259
    361
    Apr 14, 1999
    Bismarck, North Dakota
    A wiring diagram would help you do this. It appears that you have terminals on the switch that have orange, yellow, light blue, and brown wires. The brown should be the power feed. Knowing that, you should have continuity to one of the other three wires in each of the low, med, and high positions. Those three wires then go to the resistor which in turn feed the blower motor through a single shared wire.
     
  3. FlaJunkie

    FlaJunkie Veteran Member Lifetime Gold Member

    6,064
    113
    Mar 24, 2001
    Rockledge, Florida
    Are you specifically testing the switch or the motor operation on the bench?
     
  4. flidoug

    flidoug Member Gold Member

    77
    1
    Jul 28, 2007
    Panama City Bch., Fl.
  5. bourbon_scotch

    bourbon_scotch Veteran Member Lifetime Gold Member

    2,096
    66
    Jan 10, 2003
    USA
    Use a small battery, wire and a flashlight bulb
     
  6. flidoug

    flidoug Member Gold Member

    77
    1
    Jul 28, 2007
    Panama City Bch., Fl.
    I guess I need to to know which post is power and which posts are to the blower/resistor. Can’t tell by just looking at the back of the switch. Just want to make sure all is good before it gets installed.
     
  7. flidoug

    flidoug Member Gold Member

    77
    1
    Jul 28, 2007
    Panama City Bch., Fl.
    Here are pics if it helps. F4A69092-EF47-48C0-903A-DB507FD9940A.jpeg 97E35452-EED4-46BE-AEB2-16C183E6A3AC.jpeg F4A69092-EF47-48C0-903A-DB507FD9940A.jpeg 97E35452-EED4-46BE-AEB2-16C183E6A3AC.jpeg
     
  8. FlaJunkie

    FlaJunkie Veteran Member Lifetime Gold Member

    6,064
    113
    Mar 24, 2001
    Rockledge, Florida
    Try this.
    12 and 13 look like power in.
    15-16-17 are the various speed settings. I would guess 12 or 13 to 15-16-17 should short.
    I cannot see the back of your switch to give you a better answer.

    Screen Shot 12-15-17 at 02.45 PM.JPG
     

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