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Cooling System

Diagram of vehicle cooling system and its components.
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Cooling System and Components


The radiator is responsible for removing heat from the circulating coolant by the air rushing past or through it. Hot coolant from the engine naturally rises to the highest point of the radiator.  The coolant moves back and forth through various passages in the radiator while air moving past and over the cooling fins cools it.  The movement of the vehicle, as well as fans, provides the air.  Basically, the radiator works as a heat exchanger by constantly circulating cooled coolant back into the engine while hot coolant coming from the engine enters it.

Radiator Cap

Present-day radiator tops are really pressure valves that increase and manage pressure in the cooling system. Increasing the system's pressure raises the boiling point of the coolant. For every pound of increased pressure, the coolant boiling point will increase by 3ºF.


As the coolant moves through the hot engine, it removes the engine's temperature by circulating hot water coming from the block to the radiator.  Coolant is more effective than plain water in its ability to be cooled and it also has rust and erosion inhibitors for long life.

Coolant Recovery Tank

The coolant recovery tank fills in as a coolant supply source. It gets coolant from the cooling system through a weighted valve in the radiator cap. It holds the coolant for reintroduction into the cooling system when needed. At the point when extra coolant is required in the system, it should be added to the recovery tank, not straight into the radiator.

Cooling Fans

Fans are either powered directly from the operation of the engine or can also be electric fans that work independently of the engine's operation.  Its task is to move air past the radiator's fins to chill the coolant.

Fan Clutch

The fan clutch is intended to keep the proper measure of air moving through the radiator. At moderate vehicle speeds, the fan is required to move enough air through the radiator to guarantee appropriate cooling. At faster speeds, the wind stream through the radiator is adequate to give legitimate cooling without the guide of the fan. The fan clutch lets the fan free-wheel at interstate rates.


The belts are critical for powering the water pump. Be certain they're not worn, broke, or slipping. Never over-tighten belts. Over-tightened belts put excess side-load pressures on the water pump impeller shaft.  Water pump failure is assured.


Radiator hoses are liable for carrying coolant to and from the engine and the radiator. They should be inspected for indications of wear like cracking, splitting, and swelling.  They should be flexible and not hard.  Small leaks should be dealt with immediately as they can rapidly turn into a big leak and severely damage an engine by overheating.


The thermostat controls the movement of coolant into the engine block and keeps the engine block at its ideal operating temperature.  When the engine is cool, the thermostat closes which prevents the coolant from moving throughout the engine and allows it to warm up.  At operating temperature, the thermostat opens and permits more coolant to flow. A stuck thermostat can stop or limit the coolant stream to the engine and cause overheating.

Water Pump

The water pump moves a consistent volume of coolant through the radiator and through the engine.  There are various styles of water pumps but most are just an impeller connected to a shaft that's driven by a belt.  During regular maintenance service keep the belt tightened properly and keep clean, high-quality coolant in the engine to ensure a long life.