Is mazda 6 heater hose a one-way valve?

Yes The warm air pipe is the pipe connecting the water tank circulation system and the heater. When the engine starts, the water temperature rises slowly for a big cycle. The warm water pipe on the thermostat is directly connected to the small water tank of the heater, and the small water tank has temperature. Mazda 6 warm air hose is a one-way valve, and this valve chamber is connected with the air inlet pipe through the one-way valve, so the engine runs normally and the air inlet is in a negative pressure state.