The size of modern Yuedong heating pipe is 16mm.
The function of the engine warm water pipe is to flow the engine coolant into the warm air tank, which is the heating source of the air conditioning and heating system. One uses engine coolant as the heat source (currently used by most vehicles), and the other uses fuel as the heat source (used by a few mid- to high-end cars). Do you need to install a throttle valve in the car heating pipe? The car heating pipe is where antifreeze flows through it when the vehicle is cold started. When the water temperature rises, the thermostat opens and the antifreeze circulates through the water tank. Therefore, when the vehicle is cold started, , antifreeze only flows in the heater water tank.