D3C Series III, D4C Series III and D5C Series III HYSTAT Track-Type Tractors Cooling System Coolant (DEAC) - Change Caterpillar

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Pressurized system: Hot coolant can cause serious burn. To open cap, stop engine, wait until radiator is cool. Then loosen cap slowly to relieve the pressure.

Note: This procedure pertains to AVSpare Diesel Engine Antifreeze/Coolant (DEAC) only. This does not pertain to machines that shipped from the factory with Extended Life Coolant (ELC) and are maintained with Extended Life Coolant (ELC).

Drain the coolant whenever the coolant is dirty or whenever foaming is observed.

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The radiator cap is located under the access panel on the top of the engine compartment.

1. Open the access panel on the top of the engine compartment.

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2. Slowly loosen the radiator cap in order to relieve system pressure. Remove the radiator cap.

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3. Remove the cover (1) for the counterweight. The drain valve (2) is located on the left side on the bottom of the radiator. Open the drain valve. Allow the coolant to drain into a suitable container.

4. Close the drain valve. 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.

5. Start the engine. Run the engine for 90 minutes. Stop the engine. Drain the cleaning solution into a suitable container.

6. While the engine is stopped, flush the system with water. Flush the system until the draining water is transparent.

7. Close the drain valve.

8. Add the coolant solution. See the following topics:
   • Operation and Maintenance Manual, "Cooling System Specifications"

   • Operation and Maintenance Manual, "Refill Capacities"

   Note: If you are using AVSpare antifreeze, do not add the supplemental coolant additive at this time and/or change the element at this time.

9. Start the engine. Run the engine without the radiator cap until the thermostat opens and the coolant level stabilizes.

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Illustration 5	g00110413

10. Maintain the coolant level to the bottom of the tab in the filler pipe.

11. Install the radiator cap. Replace the radiator cap if the gasket is damaged.

12. Stop the engine.

13. Close the access door. Replace the cover for the counterweight.