Cooling System Basics and Overheating Response

What coolant does, why pressure matters and what to do if temperature rises unexpectedly.

A pressurized cooling system raises the boiling point of coolant. Opening a hot radiator or expansion cap can release scalding fluid and steam, so allow the system to cool and follow the manual.

Overheating can result from low coolant, leaks, fan faults, thermostat problems, a blocked radiator or other issues. If temperature enters the danger zone, reduce load and stop safely according to the vehicle guidance rather than continuing until damage occurs.