RIM ASSEM. 1M3822 - Caterpillar

Pressurized System: Hot coolant can cause serious burns. To open the cooling system filler cap, stop the engine and wait until the cooling system components are cool. Loosen the cooling system pressure cap slowly in order to relieve the pressure.
Check the coolant level when the engine is stopped and cool.
When any servicing or repair of the engine cooling system is performed, the procedure must be performed with the engine on level ground. This procedure will allow you to check accurately the coolant level. This procedure will also help in avoiding the risk of introducing an air lock into the coolant system.
Remove the cooling system filler cap slowly to relieve the pressure within the cooling system.For the correct coolant level, refer to the OEM information.Factory Installed Radiators
Illustration 1 g06165264
Typical example
The coolant level (A) is for factory installed radiator with the three cylinder engine.
The coolant level (B) is for factory installed radiator with the four cylinder turbocharged engine. Once the level has been reached, add 0.5 L (0.13210 US gal) of coolant.
The coolant level (C) is for factory installed radiator with the four cylinder turbocharged aftercooled engine.Radiator Cap
Illustration 2 g06165279
Typical example
Clean the cooling system filler cap and check the condition of the filler cap gasket (1). Replace the cooling system filler cap if the filler cap gasket (1) or the sealing surface (2) are damaged.The radiator filler cap should be check at regular intervals to insure that the filler cap relieve pressure is correct. The cooling system fill cap pressure is:
Cooling system filler cap pressure for three cylinder engine 95 kPa (13.7 psi)
Cooling system filler cap pressure for four cylinder engine 110 kPa (15.9 psi)Reinstall the cooling system filler cap when all checks are complete.