The water pipe of the automobile auxiliary kettle plays an important role in the cooling system, and its working principle mainly includes the following steps:

1. Coolant supply: The water pump pumps the coolant out of the engine water tank and delivers it to the auxiliary kettle through the water pipe. The auxiliary kettle is usually located in the engine compartment as a supplementary water tank for the cooling system to store additional coolant.

2. Coolant circulation: Coolant is stored in the auxiliary kettle and connected to the main water tank through water pipes. When the cooling system needs additional coolant, the coolant in the auxiliary kettle will be automatically sucked into the main water tank to maintain the normal level of the cooling system.

3. Balance of cooling system: The existence of the auxiliary kettle can help the cooling system to maintain balance and ensure the sufficiency and stability of cooling liquid. When the cooling system is heated to expand or the temperature fluctuates, the auxiliary kettle can provide additional cooling liquid to maintain the normal working state of the system.

Generally speaking, the water pipe connected to the auxiliary kettle helps the cooling system to maintain balance and stability by transporting and storing additional coolant. The existence of the auxiliary kettle can effectively replenish the coolant, ensure the normal operation of the cooling system under different working conditions, and improve the cooling efficiency and stability of the engine. Water pipes play an important role in connecting and conveying coolant in this process, ensuring the normal operation of the whole cooling system and the stable operation of the engine.