Operation CHARM
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GMC Truck
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1989
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Safari Van M L4-151 2.5L
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Repair and Diagnosis
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Powertrain Management
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Scan Tool Testing and Procedures
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Fan Request
Fan Request
Displays status of A/C fan control switch. Should read "yes" when A/C fan switch is in on position or when A/C system pressure exceeds calibrated value; "no" at all other times.