REGULATOR 2139673 - Caterpillar

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.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. 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 in Caterpillar machines.Dispose of all fluids according to local regulations and mandates.
Mixing ELC with other products reduces the effectiveness of the ELC and shortens the ELC service life. Use only Caterpillar products or commercial products that have passed the Caterpillar EC-1 specification for premixed or concentrate coolants. Use only Caterpillar ELC Extender with Caterpillar ELC. Failure to follow these recommendations can result in shortened cooling system component life.
See the appropriate topics in your machine's Operation and Maintenance Manual for all cooling system requirements.Note: For more information about Extended Life Coolant (ELC), see Operation and Maintenance Manual, "Extended Life Coolant (ELC)" .When a Caterpillar Extended Life Coolant (ELC) is used, an extender must be added to the cooling system. See the Operation and Maintenance Manual, "Maintenance Interval Schedule" for the proper service interval.
Park the machine on a hard, level surface. Allow the engine to cool and allow the radiator to cool.
Raise the hood in order to access the radiator.Note: See Operation and Maintenance Manual, "Engine Compartment Hood - Raise/Lower" .
Illustration 1 g00331705
Slowly loosen the filler cap in order to relieve the pressure. Remove the filler cap.
Inspect the filler cap gasket. Replace the filler cap if the gasket is damaged.
Add .71 L (.75 qt) of Caterpillar Extender to the cooling system.
Install the filler cap.