HOW-TO SECTION detailed procedures, see the vehicle/chassis maintenance manual. For types of coolant, refer to the “How to Select Coolant” section in this guide. HOT COOLANT To avoid scalding from the expulsion of hot coolant, never remove the cooling system pressure cap while the engine is at operating temperature. Wear adequate protective clothing (face shield, rubber gloves, apron, and boots). Remove the cap slowly to relieve pressure. 4. If the HVAC unit is connected to the cooling system, open the regulating valves all the way. Degreasing Degrease as follows: 1.
Fill the cooling system with a 5% solution (1.6 ounces per quart of water—50 grams per liter) of a mildly alkaline cleaning agent, such as sodium carbonate. 3. Drain all the cleaning solution. 4. Flush the cleaning solution from the cooling system. 2. Run the engine at moderate speed until the thermostat starts to open, at an operating temperature of approximately 80°C (176°F). Then run it for about five minutes longer. Shut down the engine and allow it to cool to approximately 50°C (112°F). [a] Immediately after draining the cleaning solution, flush the system with clean water. [b] Once the clean water has drained, fill the system again with clean water. [c] Run the engine.
Allow the engine to warm up to approximately 80°C (176°F), and then run it about five minutes longer. [d] Drain the hot water. 5. Fill the cooling system with new coolant. For detailed procedures, see the vehicle/chassis maintenance manual. For types of coolant, “Refer to the 100 All information subject to change without notice. (Rev. 04/08) DDC-SVC-MAN-0040 0704 Copyright © 2008 DETROIT DIESEL CORPORATION