Operation CHARM
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GMC Truck
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2003
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Envoy 4WD L6-4.2L VIN S
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Repair and Diagnosis
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Engine, Cooling and Exhaust
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Cooling System
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Testing and Inspection
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Symptom Related Diagnostic Procedures
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Coolant Heater Inoperative
Coolant Heater Inoperative
Steps 1 - 3:
Steps 4 - 5: