SISTEM PENDINGIN, PART 5: Cara Kerja Sistem Pendingin (Electric Fan)

Summary

This video explores the workings of a cooling system with electric fan control. It explains the differences between the fifth and fourth parts of the cooling system, including the transition from conventional fan control to electric fan motors. Key components such as the radiator, thermostat, and thermoswitch are discussed in detail, alongside the role of the water pump and bypass valves. The video also covers how the system adjusts based on engine temperature, including how the fan is activated when the temperature rises. The explanation concludes with a preview of the upcoming part 6, focusing on the fan motor’s electrical diagram.

Takeaways

• 😀 The video discusses the fifth part of a series on cooling systems with an electric fan control (motorized fan).
• 😀 Viewers are encouraged to watch the previous parts (1–4) to better understand the context before watching part 5.
• 😀 The main difference between part 4 and part 5 of the series is the method of fan operation: part 4 uses a mechanical connection, while part 5 uses an electric motor.
• 😀 In part 5, the fan is driven by an electric motor, meaning the fan's operation is independent of the engine's speed.
• 😀 The thermostat in part 5 has a bypass valve, unlike part 4, which does not. This affects how coolant flows within the system.
• 😀 Components mentioned include the radiator cap, upper and lower tanks, water jacket, thermostat, and thermo switch.
• 😀 The thermo switch in part 5 functions differently from a standard switch. It controls the electric fan's motor based on temperature thresholds, such as 100°C.
• 😀 The video explains the cooling process, where the engine's heat is absorbed by coolant and then transferred to the radiator, which cools it down.
• 😀 When the engine temperature exceeds a certain threshold, the thermo switch activates the fan to provide additional cooling by blowing air through the radiator.
• 😀 Once the engine cools down and the temperature drops below the set threshold, the fan motor is automatically turned off to prevent unnecessary operation.
• 😀 The video concludes with an introduction to the upcoming part 6, which will focus on the electrical diagram of the fan motor system.

Q & A

What is the main topic discussed in part 5 of the video?

The main topic discussed in part 5 is the operation of a cooling system with electric fan control, specifically how the fan motor is controlled electrically rather than mechanically, as compared to the previous part.

How does the fan operate differently in part 5 compared to part 4?

In part 4, the fan is mechanically driven by the engine's rotation, meaning the fan speed is directly linked to the engine speed. In part 5, the fan is driven by an electric motor, meaning the fan can operate independently of the engine speed.

What type of thermostat is used in part 5, and how does it differ from part 4?

In part 5, the system uses a thermostat with a bypass valve, while in part 4, the thermostat does not have a bypass valve. The bypass valve allows for better control over coolant flow, especially in varying engine conditions.

What is the function of the thermo switch in part 5 of the system?

The thermo switch in part 5 controls the electric fan motor. It connects and disconnects the electrical circuit to the fan based on the temperature detected, activating the fan when the temperature reaches a certain threshold.

What happens when the coolant temperature reaches the threshold in part 5?

When the coolant temperature reaches the threshold (for example, 100°C), the thermo switch activates, completing the electrical circuit to the fan motor, which then operates the fan to help cool down the radiator.

What is the role of the radiator in the cooling system?

The radiator's role is to dissipate heat from the coolant that absorbs heat from the engine. The coolant flows through the radiator, where it is cooled by airflow facilitated by the fan and the radiator's aluminum fins.

How does the water pump contribute to the cooling process in part 5?

The water pump circulates the coolant throughout the engine, pumping it through the water jacket (a system of cooling channels in the engine block) and the radiator to ensure that the engine maintains a safe operating temperature.

What happens when the coolant temperature drops after the fan is activated?

When the coolant temperature drops after the fan operates, the thermo switch turns off, disconnecting the fan's electrical circuit, and the fan stops operating as the temperature falls below the threshold.

Why is there a need for a reservoir tank in the cooling system?

The reservoir tank is used to store excess coolant when the pressure in the radiator increases, allowing for safe release of excess coolant when it expands due to high temperatures. It also ensures that coolant can be drawn back into the radiator when the coolant volume decreases.

What is the purpose of the pressure valve in the radiator system?

The pressure valve in the radiator system prevents the coolant from reaching a pressure level that could cause damage to the radiator or engine. If the pressure exceeds a certain threshold, the valve opens to release excess coolant into the reservoir tank.