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Home >> GMC >> 1987 >> Forward Control 6.2 J, Standard >> Repair and Diagnosis >> Engine Mechanical >> Engine Cooling Fan >> Cooling System Maintenance >> Refilling

Cooling System Maintenance: Refilling

To prevent air from being trapped in engine block, engine should be running when refilling cooling system. After system is full, continue running engine until thermostat is open, then recheck fill level. Do not overfill system.