FLANGE 2255244 - 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.
Excessive additive (greater than the recommended 6% initial fill) together with concentrations of antifreeze greater than 60% cause deposits to form and can result in radiator tube blockage and overheating.
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.
Note: This procedure pertains to Caterpillar Diesel Engine Antifreeze/Coolant (DEAC) only. This procedure does not pertain to machines that are shipped from the factory with Extended Life Coolant (ELC) or to machines that are maintained with Extended Life Coolant (ELC).Use an 8T-5296 Test Kit to check the concentration of the coolant.
Open the rear engine hood. Slowly loosen the cooling system pressure cap in order to relieve system pressure. Remove the cooling system pressure cap.
If necessary, drain enough coolant from the radiator in order to allow the addition of the liquid supplemental coolant additive. The coolant drain valve is located on the bottom left side of the radiator.
Add 0.24 L (0.25 qt) of liquid supplemental coolant additive to the cooling system.
Clean the cooling system pressure cap and install the cooling system pressure cap. Close the engine hood.