Operation CHARM
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Chevy Truck
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1982
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S10,T10 P/U,Blazer V6-173 2.8L
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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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Tools and Equipment
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Positions
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A/C - Compressor Switch
A/C - Compressor Switch
The scan switch displays the on and off status of the ECM
A/C signal
line. On condition indicates ECM command to energize compressor clutch.