Anyone know what this part does?

Discussion in 'General Maverick/Comet' started by CaliMaverick72, Oct 12, 2021.

  1. CaliMaverick72

    CaliMaverick72 Member

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    I located this unit under the dash, passenger side of my 72 Maverick 4 door. It was unplugged and when partially plugged in, the unit vibrates and buzzes. I am trying to get my interior fan switch to operate the different speeds again but came across this. Also, if anyone has a recommendation on what to check for my fan speed selector not working anymore, that would be great. It just stopped working one day a couple years ago. I replaced the red resistor on the blower housing and that didn’t fix it.
     

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  2. kansas_grabber

    kansas_grabber Member

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    Part number search indicates it's the buzzer for the seat belt and ignition key. It was probably intentionally unplugged. That's one of the first things I did on my '73 when I got it many years ago.
     
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  3. CaliMaverick72

    CaliMaverick72 Member

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    Thanks for that info. Makes sense now.
     
  4. mojo

    mojo "Everett"- Senior Citizen

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    Is the fan working on any speed?
     
  5. CaliMaverick72

    CaliMaverick72 Member

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    There is some air flow through the vents/defroster but does not change with speed selector switch on dash.
     
  6. CaliMaverick72

    CaliMaverick72 Member

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    Also it’s very little air flow
     
  7. Jaybee

    Jaybee Member

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    Oooh, save that, it's rare! Mostly because everyone hated that buzzer so much one of the first things they did was find it and get rid of it. :LOL:
     
  8. CaliMaverick72

    CaliMaverick72 Member

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    Haha. That’s some good advice. May be worth a lot of money some day.
     
  9. Acornridgeman

    Acornridgeman MCCI Wisconsin State Rep Moderator Supporting Member

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    If you're in a boneyard, pluck one out of a newer car that has the chime tones instead of the buzzer. They swap right in, same plug.
     
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  10. Constable

    Constable You have the right to remain silent....or not!

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    Most commonly, when the fan speed doesn't change, it is due to a defective resistor. These are usually a plug in module under the dash not far from the fan. They're often attached to the back of the heater box. Haven't ever replaced one in a Mav so I'm going by other cars.
     
  11. mojo

    mojo "Everett"- Senior Citizen

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    I replaced my resistor a few years ago when I had similar issue as CalifMaverick. I did have hi-speed only -- fan worked on hi-speed. Replacing resistor solved my issue.
    CaliMav. replaced his resistor -- didn't solve his problem. Maybe the motor is bad?
     
  12. Craig Selvey

    Craig Selvey Indiana State Rep - MCCI

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    It doesn't sound like your fan is working at all. You should be able to hear it/feel it when it is working and turned on. I bet it is the fuse.
     
  13. mojo

    mojo "Everett"- Senior Citizen

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    If fuse is bad, most likely, has a short circuit or motor drawing to much current. If replacement, blows a 2nd fuse, that is where I would concentrate my research efforts.
     
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  14. Krazy Comet

    Krazy Comet Tom Supporting Member

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    Agreed, if resistor is bad, HIGH will still operate. High bypasses resistor, lower speeds have a voltage/current drop through resistor.
     

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