Maintenance 97 Flushing Cooling System Before filling, flush out the system thoroughly with clean water. Before flushing out the radiator, remove the lower radiator hose to allow a quicker and more efficient draining. When flushing the radiator, keep the water pressure low so the radiator tubes are not damaged. W2003948 Filling Cooling System Always use a pre-mixed solution of 50/50 clean water and antifreeze. DO NOT fill system with water and then add antifreeze. A mixture with less than 40% antifreeze does not give adequate corrosion protection. Concentrations of antifreeze above 60% does not give added freeze protection. The system is self-venting.
1 Fill the system with clean coolant through the fill neck in the middle of the surge tank. The fill rate is not to exceed 2 gpm (8 L/min.). The engine should not be running and the heater control should be on WARM. W2003082 2 Fill up to the top of the surge tank. 3 Check the level after running the engine at high idle for approximately five minutes. Add coolant as required.