Car hot air ducts are usually located in the engine compartment
Hot air ducts are also called heater ducts. The warm air pipe is a pipe that carries the heat of the engine into the car through the water in the car water tank, making the car warm. Generally, it is one in and one out. If installed incorrectly, the water flow may be too smooth, and it will not have much impact. If it ruptures, the car's coolant will leak, the engine will have poor or no heat dissipation, and the water temperature will rise, causing great damage to the car.