Car engine cooling system

Summary

This video provides a detailed explanation of the engine cooling system, starting with the coolant’s entry through the radiator and its circulation through various components like the circulation pump, thermostat, and cylinder cooling jacket. It covers the crucial temperature regulation process controlled by the thermostat, which ensures coolant flows to the radiator for cooling when necessary. The video also explains pressure management in the system via release and inlet valves, and how the cooling system adapts to engine temperature changes, ensuring optimal performance and preventing overheating.

Takeaways

• 😀 The engine cooling system circulates coolant to regulate temperature and prevent overheating.
• 😀 The circulation pump is responsible for moving coolant through the engine, starting with the radiator.
• 😀 Coolant travels through various components like the crankcase cover, cylinder cooling jacket, and cylinder head gasket.
• 😀 Fluid enters the cylinder head, with a dedicated outlet for heating the intake manifold.
• 😀 The pipe connects the circulation pump to the thermostat housing, controlling the flow of coolant.
• 😀 The thermostat acts as a valve, regulating coolant flow based on temperature. Below 80°C, it blocks the radiator path.
• 😀 As the engine heats above 80°C, the thermostat opens to direct coolant to the radiator for cooling.
• 😀 The impeller in the radiator helps cool the fluid as it passes through the system.
• 😀 In case of critical overheating, the release valve activates, discharging excess pressure and coolant into the expansion tank.
• 😀 The expansion tank also handles pressure fluctuations, allowing coolant to be returned to the system as it cools and contracts.
• 😀 The cooling system ensures consistent coolant levels by releasing and returning liquid as the engine temperature fluctuates.

Q & A

What is the role of the circulation pump in the engine's cooling system?

The circulation pump is responsible for pumping coolant into the cylinder block jacket, ensuring that the coolant flows through the engine to absorb heat and prevent overheating.

How does coolant flow through the engine during operation?

Coolant flows from the radiator, through the circulation pump, into the cylinder block jacket, and then through special holes in the cylinder head gasket. It circulates through the system, absorbing heat from the engine, before returning to the radiator.

What is the function of the thermostat in the cooling system?

The thermostat regulates the flow of coolant based on the engine temperature. When the fluid temperature is below 80°C, it blocks the path to the radiator. When the temperature rises above 80°C, it opens the path to the radiator to cool the fluid.

What happens when the engine coolant temperature is below 80°C?

When the temperature is below 80°C, the thermostat's shut-off element blocks the coolant's path to the radiator, directing it back to the circulation pump for re-circulation.

What happens when the coolant temperature exceeds 80°C?

When the coolant temperature exceeds 80°C, the thermostat opens, allowing the coolant to flow to the radiator, where it is cooled by the impeller before being recirculated.

What is the purpose of the radiator cap in the cooling system?

The radiator cap has two valves: the inlet valve and the exhaust valve. It controls the pressure in the system, ensuring that excess coolant and pressure are released into the expansion tank during overheating.

What occurs when the coolant experiences critical overheating?

During critical overheating, the coolant expands, creating excess pressure. The release valve on the radiator cap is activated, discharging the excess pressure and coolant into the expansion tank.

How does the cooling system manage pressure during engine cooling?

When the engine cools down, the coolant contracts, creating a vacuum in the system. Atmospheric pressure then pushes coolant from the expansion tank back into the system when the inlet valve opens.

What role does the expansion tank play in the engine's cooling system?

The expansion tank stores excess coolant and helps manage pressure fluctuations. It allows for the discharge of excess coolant during overheating and the reintroduction of coolant into the system when the engine cools and contracts.

Why is it important to maintain the correct temperature for the coolant in the engine?

Maintaining the correct coolant temperature ensures that the engine operates at an optimal temperature range, preventing overheating, engine damage, and ensuring efficient performance.