| Inlet tank | Coolant enters radiator here via a hose. |
| Core | Coolant passes through water tubes where heat is removed via cooling fins and air passing through the core matrix. |
| Outlet tank | Coolant collects here, then leaves radiator and passes back to engine via a hose. Automatic cars usually have an oil cooler in the outlet tank. |
| Water pump | Pumps the coolant through the cooling system maintaining a velocity suitable for heat transfer. |
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Fan & | Attached to the radiator to ensure air flow even when stationary. Initially mechanically powered, fans are now electrically powered for most applications. |
| Coolant | A mixture of specific chemical additives & demineralised water to prevent freezing, increase the boiling point & prevent corrosion of the cooling system. It transfers the heat from the engine to the atmosphere via the radiator. The recommended coolant must be used. |
| Overflow Reservoir | Plastic container that contains extra coolant for the radiator and provides a place for overflow to pass to while still remaining in the system. Extra liquid should be added here when required. |
| Thermostat Valve | Assists the engine to quickly reach and maintain the proper temperature by shutting when the coolant is cold, allowing it to first heat up in the engine. |
| Radiator Pressure Cap | At the top of the radiator or overflow reservoir. Allows the system to operate under pressure which increases the coolant boiling temperature. Do not open when hot. Has two valves - a pressure valve and a vacuum valve. |
| Heater Core (Assy) | Heats passenger compartment. |