Blower motor not working

Discussion in 'General Ranchero Help' started by andy nelson, Dec 5, 2018.

  1. andy nelson

    andy nelson In First Gear

    Messages:
    4
    any help? It’s a 74 model...not sure if it’s not getting power or motor locked up..TIA
     
  2. Jeff B

    Jeff B In Maximum Overdrive BRONZE MEMBER

    Messages:
    1,140
    Location:
    SoCal
    Pull the power lead off the motor and check for power at the plug. Fuses, resistors, switches are possible issues. Power the fan motor while disconnected to test. Some of the blower motors are hard to find and if
    you remove the motor, be careful with the squirrel cage, those can be hard to find as well on certain years.
     
  3. TestDummy

    TestDummy In Maximum Overdrive SILVER MEMBER

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    C'Ville
    ForistellFord likes this.
  4. 72GTVA

    72GTVA Administrator Staff Member

    Messages:
    8,995
    Location:
    Chesapeake, VA
    There is a blower motor resistor in line with the blower motor lead. The resistor is located in the blower case. It has 3 resistors that vary the current to the motor to control it's speed.

    If the blower motor resistor has failed, and they often fail on only one or two of the resistors or can fail across all of them, the blower motor won't run in the fan speed selected that uses that resistor. The sketch below shows the location of the resistor, and is shown circled in the sketch below, it is held in the blower case with a couple of plastic push rivets - (hint: it is inside the cab approximately directly above the right side of the transmission hump, basically above the passenger floorboard):

    [​IMG]

    Other things to check: Ensure the blower ground has a good connection to the cowl, that your block to firewall ground is present and has good connection, and check the fuse in the panel.
     
    Freestyle Don likes this.
  5. andy nelson

    andy nelson In First Gear

    Messages:
    4
    Thanks I’ll check that this weekend!
     

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