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92 W900b ac wiring

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

Aug 14, 2025 #1

Hman621 Bobtail Member

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May 2, 2022

0

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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Aug 14, 2025 #2

BoxCarKidd Road Train Member

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Aug 26, 2014

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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.
Aug 14, 2025 #3

BoxCarKidd Road Train Member

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Aug 26, 2014

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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.
Aug 14, 2025 #4

Star Rider Road Train Member

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Sep 23, 2019

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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,

Star Rider, Aug 14, 2025

Star Rider, Aug 14, 2025

#4

BoxCarKidd Thanks this.