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Personal injury can result from hot coolant, steam and alkali. At operating temperature, engine coolant is hot and under pressure. The radiator and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns. Remove cooling system pressure cap slowly to relieve pressure only when engine is stopped and cooling system pressure cap is cool enough to touch with your bare hand. Do not attempt to tighten hose connections when the coolant is hot, the hose can come off causing burns. Cooling System Coolant Additive contains alkali. Avoid contact with skin and eyes. |
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Note: This procedure pertains to Caterpillar Diesel Engine Antifreeze/Coolant (DEAC) only. This does not pertain to machines that are shipped from the factory with Extended Life Coolant (ELC). This does not pertain to machines that are maintained with Extended Life Coolant (ELC).
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Do not change the coolant until you read and understand the material in the Cooling System Specifications section. |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates. |
If the coolant is dirty or if you observe any foaming in the cooling system, drain the coolant before the recommended interval.
- Stop the engine. Allow the cooling system to cool completely.
- Open the access door on the right side of the machine.
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| Illustration 1 | g00588901 |
- Pull the lever (1) that is located above the radiator. The lever (1) opens the access door (2) for the cooling system pressure cap (3). The access door for the cooling system pressure cap is located on the operator's platform.
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| Illustration 2 | g00588917 |
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| Illustration 3 | g00588925 |
- Slowly loosen the cooling system pressure cap (3) in order to relieve the pressure. Slowly remove the cooling system pressure cap.
- The drain valve (4) is located on the bottom corner of the radiator. Open the drain valve. Allow the coolant to drain into a suitable container.
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| Illustration 4 | g00588940 |
- Close the drain valve (4). Fill the system with a solution which consists of clean water and of cooling system cleaner. The concentration of the cooling system cleaner in the solution should be between 6 percent and 10 percent.
- Start the engine. Run the engine for 90 minutes. Stop the engine. Drain the cleaning solution into a suitable container.
- While the engine is stopped, flush the system with water. Flush the system until the draining water is transparent.
- Close the drain valve (4) .
- Add the coolant solution. See the following topics:
- Special Publication, SEBU6250, "Cooling System Specifications"
- Operation and Maintenance Manual, "Refill Capacities"
Note: If you are using Caterpillar antifreeze, do not add the supplemental coolant additive at this time and/or change the element at this time.
- Special Publication, SEBU6250, "Cooling System Specifications"
- Start the engine. Run the engine without the cooling system pressure cap until the thermostat opens and the coolant level stabilizes.
- Maintain the coolant level within 1 cm (0.5 inch) of the bottom of the filler pipe.
- Replace the cooling system pressure cap if the gasket is damaged. Install the cooling system pressure cap.
- Stop the engine.
- Close and lock the access doors.