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Home >> GMC >> 1988 >> Forward Control 4.8 T, Automatic, 475/M40 >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Cooling System Specifications >> Coolant Specifications >> Maintenance Schedule

Maintenance Schedule

Inspect cooling system every 12 months or 15,000 miles. Drain, flush and refill cooling system 24 months or 30,000 miles. Maintain ethylene glycol and water solution at a mixture of 50/50.