What basic preventive maintenance task must be carried out on the vehicle's cooling system?

Question

DentroTest · Accepted Answer

The coolant level in the expansion tank must be checked periodically with the engine off and cold, and with the vehicle on level ground. This way the measurement is accurate, between the minimum and maximum marks, and the risk of burns from steam or boiling liquid under pressure is avoided. Checking it with the engine hot is dangerous, because when the cap is opened the overpressure can expel the liquid and cause injuries, and thermal expansion distorts the reading. Adding tap water until the maximum mark is exceeded is also a mistake: the maximum level must not be exceeded, and ordinary water has no antifreeze properties.

What basic preventive maintenance task must be carried out on the vehicle's cooling system?

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