The car water tank, also known as the car radiator, is the main part of the car cooling system; its function is to dissipate heat. The cooling water absorbs heat in the water jacket, flows to the radiator to dissipate the heat, and then returns to the water jacket and circulates continuously. Thus, the effect of heat dissipation and temperature regulation is achieved. It is also an important part of the car engine.

The car water tank is mainly composed of a radiator core, a water pipe, a heat dissipation air blade, an upper water tank and a lower water tank. The upper water tank is on the radiator, and the water pipe connects the upper water tank with the water tank below the radiator. When the hot water flows from top to bottom to the lower water tank, it becomes warm water. The heat dissipation air blades form a channel. 

The auxiliary water tank is mainly used to balance the pressure of the cooling system, and it also plays a role in replenishing water. When the vehicle is started for the first time, the coolant in the auxiliary water tank will be sucked into the main water tank for cooling and heat dissipation of the engine. When the pressure of the entire cooling system is too high, the coolant in the main water tank will flow back to the auxiliary water tank to reduce the pressure of the main water tank.