Check the coolant oil level during shutdown periods at the specified interval.
Must be noted these points “remove the radiator cap after allowing the engine to cool, and, if necessary, add coolant until the level is about 3/4 in” And More critical role is balancing diesel engines require a balanced coolant mixture of water, antifreeze, and coolant additives.
Examine the exterior of the radiator for obstructions, and remove all dirt, grimy or foreign material with a soft brush or cloth with caution to avoid damaging the fins.
If available means, use the low-pressure compressed air or a stream of water in the opposite direction of normal airflow to clean the radiator.