Operation CHARM
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Chevy Truck
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1990
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C 1500 Truck 2WD V8-350 5.7L
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Repair and Diagnosis
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Powertrain Management
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Computers and Control Systems
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Testing and Inspection
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Scan Tool Testing and Procedures
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Positions
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A/C Request - A/C Clutch
A/C Request - A/C Clutch
The A/C Request position displays the status of the
A/C signal
line to the ECM. The A/C Clutch position displays "on" when the ECM energizes the compressor clutch.