BOSS 8D1251 - Caterpillar

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.
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.
Mixing ELC with other products that do not meet Caterpillar EC-1 specifications reduces the effectiveness of the coolant and shortens coolant service life. Use only Caterpillar products or commercial products that have passed the Caterpillar EC-1 specification for pre-mixed or concentrate coolants. Use only Caterpillar Extender with Caterpillar ELC.Failure to follow these recommendations can result in shortened cooling system component life.
ReferenceFor information about adding Extender to your cooling system, refer to Operation and Maintenance Manual, "Cooling System Coolant Extender (ELC) - Add" or consult your Caterpillar dealer.If an Extended Life Coolant was previously used, flush the cooling system with clean water. No other cleaning agents are required. Use the following procedure to change the Extended Life Coolant.
Illustration 1 g00270343
The cooling system pressure cap is located under the engine hood at the rear of the machine. Tilt the engine hood in order to access the cooling system pressure cap.
Slowly loosen the cooling system pressure cap in order to relieve system pressure. Remove the cooling system pressure cap.
Illustration 2 g00270344
Open the drain valve on the bottom of the radiator. Allow the coolant to drain into a suitable container.
Flush the cooling system with clean water until the draining water is clean. Close the drain valve.
Replace the water temperature regulator.ReferenceRefer to Operation and Maintenance Manual, "Cooling System Water Temperature Regulator - Replace" for the correct procedure.
Add the Extended Life Coolant.ReferenceRefer to Operation and Maintenance Manual, "Refill Capacities" for the refill capacity of the cooling system.
Start the engine. Run the engine without the cooling system pressure cap until the water temperature regulator opens and the coolant level stabilizes.
Illustration 3 g00270345
Maintain the coolant level in the sight gauge on the upper right side of the radiator.
Install the cooling system pressure cap. Close the engine hood.