Ac meltdown

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Stevenmark, Sep 15, 2019.

  1. Stevenmark

    Stevenmark Bobtail Member

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    Sep 15, 2019
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    Two weeks ago ac climate controls were on full blast constant. Not even shutdown at end of day. Started up one mornin and almost immediately smelled electronics burning up. Now no fan speed selector control or clutch engagement.
    Im thinking resistor card of some sort. Im going in, any ideas or...suggs?
     
    DUNE-T Thanks this.
  2. boneebone

    boneebone Road Train Member

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    I would check the fuses, relays and wiring first to make sure you have power to the switch and compressor.

    Then I would check the blower resistor and fan speed selector switch.
     
    Stevenmark Thanks this.
  3. Goodysnap

    Goodysnap Road Train Member

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    What are we working on?

    Most melted connections at switch's , resistor's which are melting can be traced back to a blower motor that is worn out and drawing excess current. The excessive current generates heat at the weakest connections in the circuit. Dont forget to replace HVAC filters as restriction in air flow on the inlet side of the blower will also cause increased amperage.
     
  4. Stevenmark

    Stevenmark Bobtail Member

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    Thank you bone, after 2 cups of coffee i realized i misspoke, i do have fan speed control and the blue ac light is lit. However...
    I agree with the resistor or resistor slot card plug in being (refraggitated) lol
    Its 2018 western star dumper. Gotta find my torx screws and sniff around literally!
    Thanx fer responding!
     
    boneebone Thanks this.
  5. Stevenmark

    Stevenmark Bobtail Member

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    Wow food for thought. I never pictured that scenario.
    2018 WesternStar tri-axle dumper.
    Thanx goody
     
  6. Stevenmark

    Stevenmark Bobtail Member

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    And i was just on top of the detroit engine polishing my glass and chrome and was annoyed to see the screen on top of the actual filter housing all ugly with grass debris. Thanx cuz
     
  7. Stevenmark

    Stevenmark Bobtail Member

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    Today my filter lamp just lit up! Too much coincidence. I guess at 59 i finally do know a thing or two? Lol lol
     
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