HOSE AS 3406170 - Caterpillar

You must read and understand the warnings and instructions contained in the Safety section of this manual before performing any operation or maintenance procedures.Cooling System
Change Coolant & Thermostat/Clean System
Do not change the coolant until you read and understand the material in the Cooling System Specifications section.
Drain the coolant earlier if the coolant is dirty or foaming is observed. 1. Remove the radiator cap slowly to relieve pressure. 2. Open the drain valve at the bottom of the radiator and allow coolant to drain. Drain coolant into a suitable container. Always dispose of drained fluids as established by local regulations.3. Close the drain valve.4. Fill the system with clean water and a 6 to 10% concentration of cooling system cleaner.5. Start and run the engine for 1 1/2 hours.6. Stop the engine. Open the drain valve at the bottom of the radiator and allow coolant to drain.7. Flush the system with water, with the engine stopped, until the draining water is clear.8. Close the drain valve. Install a new thermostat. See the service manual for complete instructions.9. Add the coolant solution. Refer to Cooling System Specification and Lubricant Viscosities and Refill Capacities in the Maintenance Section of this manual. Do not add supplemental coolant additive at this time, unless you are not using Caterpillar Antifreeze which contains additive.10. Start the engine and operate it, with the radiator cap off, until the thermostat opens and the level stabilizes.11. Maintain the coolant level to within 1 cm (1/2 in) of the bottom of the fill pipe.12. Replace the radiator cap if the gasket is damaged. Install the cap.13. Stop the engine.