Can't say how the OP's engine works, since I think he still hasn't said what it is. But on mine if the air pressure is not up the engine fan solenoid will not work and the ECM will shut the AC compressor down.
Used AS-IS Truck, Lemon Law/Fraud Case Help
Discussion in 'Ask An Owner Operator' started by ljesko13, Aug 30, 2021.
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The compressor is shut down by the high pressure switch in the ac line.
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The engine fan kicked on when the air pressure was removed from the fan clutch -
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