In the preventive maintenance of a bus, is it mandatory to check the engine coolant level?

Question

DentroTest · Accepted Answer

Checking the coolant level is part of the essential preventive maintenance that every bus driver must carry out regularly. This check must be done with the vehicle parked on level ground and the engine cold, visually checking through the transparent expansion tank that the fluid stays strictly between the "MIN" and "MAX" marks. The maximum level must never be exceeded nor allowed to overflow, because the system needs an air chamber to compensate for the expansion of the liquid as it heats up and the resulting pressure; an excess would cause the coolant to be expelled or overpressure in the hoses. Likewise, waiting for the engine to suffer abnormal heating is incorrect and dangerous, since the mechanical damage from overheating could already have occurred.

In the preventive maintenance of a bus, is it mandatory to check the engine coolant level?

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