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92 W900b ac wiring

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Hman621, Aug 14, 2025.

  1. Aug 14, 2025 #1
    Hman621

    Hman621 Bobtail Member

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    May 2, 2022
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    Does anyone have a ac wiring schematic for 92 w900b? Trying to find which wire controls conpressor clutch
     
    Hman621, Aug 14, 2025
    Hman621, Aug 14, 2025
    #1
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  3. Aug 14, 2025 #2
    BoxCarKidd

    BoxCarKidd Road Train Member

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    No but memory says odd wire on blower switch is for the compressor. Then to the thermostat. Trinary switch on dryer controls the fan and the power to compressor.
     
    BoxCarKidd, Aug 14, 2025
    BoxCarKidd, Aug 14, 2025
    #2
    Star Rider Thanks this.
  4. Aug 14, 2025 #3
    BoxCarKidd

    BoxCarKidd Road Train Member

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    In front of the clutch pedal fuse box? Fuse and relay there? Look for burnt connectors.
     
    BoxCarKidd, Aug 14, 2025
    BoxCarKidd, Aug 14, 2025
    #3
    Star Rider Thanks this.
  5. Aug 14, 2025 #4
    Star Rider

    Star Rider Road Train Member

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    There is a micro switch in your HVAC controls, when you move it to AC or defrost it gets bumped.

    Looks like this,

    upload_2025-8-14_23-59-43.jpeg
     
    Star Rider, Aug 14, 2025
    Star Rider, Aug 14, 2025
    #4
    BoxCarKidd Thanks this.
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