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GMC
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1989
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Forward Control 3.9 L, Automatic, 400/M40
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Repair and Diagnosis
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Engine Performance
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Air Cleaner - Thermostatic
Air Cleaner - Thermostatic
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Description
Vacuum Actuated
Operation
Vacuum Actuated (S & T Models)
Wax-Pellet Actuated (All Others)
Component Testing
Temperature Sensor Test (S & T Models)
Vacuum Motor Test (S & T Models)
Wax-Pellet Actuated (All Others)