Cooling system explained

Question

The cooling system helps keep the engine at the right temperature.

When the engine runs, it creates heat. Coolant flows through the engine block to absorb that heat, then moves to the radiator to cool down before returning back into the engine.

Main parts:

Radiator
Cools the hot coolant using airflow.

Water pump
Pushes coolant around the system.

Thermostat
Controls when coolant flows to the radiator. It stays closed when the engine is cold, then opens when the engine reaches operating temperature.

Upper hose
Carries hot coolant from the engine to the radiator.

Lower hose
Returns cooled coolant from the radiator back to the engine.

Expansion tank
Stores extra coolant as pressure and temperature change.

Heater core
Uses hot coolant to provide warm air inside the cabin.

Simple flow:

Engine gets hot → coolant absorbs heat → radiator cools it → coolant returns to engine.

Without a good cooling system, the engine can overheat, lose performance, or suffer serious damage.

Video