1. COOLING SYSTEM IN IC ENGINES

2. Cooling System
An automobile’s Cooling system is to maintain the engine’s temperature at optimal levels.

3. Types Of Cooling System
Air Cooling System
Liquid Cooling System

4. Air Cooling System
Air flows over cooling fins around the outside of the cylinder and head by the natural motion of the vehicle.

5. Air Cooling System

6. LIQUID COOLING SYSTEM

7. Liquid Cooling System
An Liquid Cooling system is the collection of parts and substances (coolants) that work together to maintain the engine’s temperature at optimal levels.

8. Liquid cooling system parts
Water pump
Radiator
Thermostat
Fan
Pressure cap
Hoses
Coolant

9. Liquid Cooling System

10. Coolant Passage

11. Water pump
A water pump is a simple device that will keep the coolant moving as long as the engine is running.  It is usually mounted on the front of the engine and turns whenever the engine is running. .

12. WaterPump

13. Radiator
Radiator is used to cool the coolant delivered from the engine.
The radiator core is usually made of flattened aluminum tubes with aluminum strips that zigzag between the tubes.  These fins transfer the heat in the tubes into the air stream to be carried away from the vehicle

14. Radiator

15. Thermostat
The thermostat is simply a valve that measures the temperature of the coolant and, if it is hot enough, opens to allow the coolant to flow through the radiator.  If the coolant is not hot enough, the flow to the radiator is blocked and fluid is directed to a bypass system that allows the coolant to return directly back to the engine. 

16. Thermostat Valve

17. Radiator Fan
The radiator fan has blades that spin rapidly to provide sufficient air that would cool the engine. It is usually mounted between the radiator and the engine so that the air can easily get to the radiator.

18. Radiator Fans

19. Radiator Pressure Cap
The radiator pressure cap is a simple device that will maintain pressure in the cooling system up to a certain point.  If the pressure builds up higher than the set pressure point, there is a spring loaded valve, to release the pressure.

20. Radiator Pressure Cap

21. Radiator Pressure Cap

22. Radiator Hose
There are several rubber hoses that make up the plumbing to connect the components of the coolingsystem. 
The main hoses are called the upper and lower radiator hoses. 
Materials :EPDM(Ethylene propylene diene monomer), Nitrile rubber & Neoprene rubber

23. Radiator Hose

24. Heater Core
In Heater Core hot coolant is used to provide heat to the interior of the vehicle when needed.

25. Heater Core

26. Coolant
The coolant in today's vehicles is a mixture of ethylene glycol (antifreeze) and water.  The recom-mended ratio is fifty-fifty. 

27. Coolant

28. THANK YOU