Radiator coolant of a diesel generator: Rust preventive & Antifreeze Coolant
When the generator set runs, the diesel engine pumps coolant to the radiator to bring away heat generated by the engine. There are two main types of coolants, where the coolant fluids are composed of purified water and rust preventive or antifreeze:
1) Rust preventive: an anti-rust liquid to prevent corrosion in most conditions.
2) Antifreeze: in addition to the anti-rust property, an antifreeze is for operation under cold weather conditions. It prevents water from freezing which may damage the internal components.
For Cummins diesel generators, Fleetguard coolants are a convenient choice to ensure the coolant circulates effectively. There is no need to add water when using Fleetguard coolants. There are other alternatives, but you may have to mix the liquids in different ratios according to specific temperature requirements.