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Home >> GMC >> 1983 >> Forward Control 6.2 J, Standard >> Repair and Diagnosis >> Engine Mechanical >> Engine Cooling Fan >> Cooling System Maintenance >> Draining
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Cooling System Maintenance: Draining

Remove radiator cap, open heater control valve to maximum heat position, if equipped, open drain cocks or remove plugs in bottom of radiator and in engine block. In-line engines usually have one plug or cock, while V-engines will have 2, one in each bank of cylinders.