Cooling System 49 Changing from Regular to Extended Life Coolant Drain the system of old coolant and dispose of properly. The cooling system should be flushed with clean water. If significant deposits are visible, use a reputable commercial cooling system flush designed for heavy duty diesel engines. For specific information on draining and flushing, see “Flushing Cooling System, D12D” page 96. Note: Extended Life Coolant is not recommended by all engine manufacturers. Contact other manufacturers for their current recommendations. WARNING DO NOT remove the cap to the coolant surge tank while the engine and radiator are still hot.
Scalding fluid and/or steam may be blown out under pressure if the cap is taken off too soon. 1 Drain the coolant into a suitable container. Make sure the heater temperature controls and valves are open. Note: Always dispose of coolant according to Federal or local regulations. Take all used coolant to a recycling or waste collection center. 2 Flush the system with clean water to remove any settled debris. Note: Keep the water pressure low so as not to damage the tubes of the radiator.