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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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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. 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 on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
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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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Mixing Extended Life Coolant (ELC) with other products reduces the effectiveness of the coolant and shortens coolant life. Use only Caterpillar products or commercial products that have passed the Caterpillar EC-1 specifications for premixed or concentrate coolants. Use only Caterpillar Extender with Caterpillar ELC. Failure to follow these recommendations could result in the damage to cooling systems components. If ELC cooling system contamination occurs, refer to Operation and Maintenance, "Extended Life Coolant (ELC)" under the topic ELC Cooling System Contamination. |
Drain the coolant whenever the coolant is dirty. Drain the coolant when foam is observed.
- Stop the engine. Allow the cooling system to cool completely.
- Open the engine access cover.
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| Illustration 1 | g00669257 |
- Slowly loosen the cooling system pressure cap in order to relieve system pressure. Remove the cooling system pressure cap.
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| Illustration 2 | g00669261 |
- Open the drain valve at the bottom of the radiator. Allow the coolant to drain into a suitable container.
- Close the drain valve. Fill the cooling system with clean water and with a 6 to 10% concentration of cooling system cleaner.
- Start the engine. Run the engine for 90 minutes.
- Stop the engine. Allow the cooling system to completely cool.
- Open the drain valve at the bottom of the radiator. Drain the cleaning solution.
- Flush the cooling system with water until the draining water is transparent.
- Close the drain valve.
- Add the recommended amount of extender to the coolant system. Refer to Operation and Maintenance Manual, "Refill Capacities" for the proper amount.
Note: If you are using CaterpillarLong Life Coolant that contains some additive, do not add any supplemental coolant additive at this time. Also, do not change the coolant conditioner element if you are using CaterpillarLong Life Coolant that contains some additive.
- Take off the cooling system pressure cap. Start the engine and run the engine. Leave the cap off until the thermostat opens and the coolant level stabilizes.
- Maintain the coolant level to 1 cm of the bottom of the fill pipe.
- Inspect the gasket on the cooling system pressure cap. Replace the cooling system pressure cap if the gasket is damaged.
- Install the cooling system pressure cap.
- Close the engine compartment.