Operation CHARM
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GMC Truck
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1987
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Safari Van M L4-151 2.5L
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Repair and Diagnosis
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Heating and Air Conditioning
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Testing and Inspection
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Component Tests and General Diagnostics
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Functional Test/Check
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Functional Test - Without A/C
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Base Heater
Base Heater
Figure 6-Heater Blower Switch Electrical Positions:
