How thick is the heating pipe of Langdong car?

16mm. Langdong is a compact car introduced by Beijing Hyundai in 20 12. The heating pipe is 16mm. The warm water pipe is a pipe that brings the heat of the engine to the car through the "water" in the car water tank to keep the car warm. Usually one in and one out. If installed incorrectly, the water flow may be too smooth.