Standard Procedure - Draining Cooling System 5.9L Engine
WARNING:
DO NOT remove cylinder block drain plugs or loosen radiator drain-cock with system hot and under pressure. serious burns from coolant can occur.
DO NOT WASTE reusable coolant. If solution is clean, drain coolant into a clean container for reuse.
- Remove radiator pressure cap.
- Loosen radiator petcock.
- Remove cylinder block drain plugs. Refer to Fig 1.