The blue and red switch buttons on the right, blue stands for cold air and red stands for hot air. When you turn on the air conditioner, you must be in the position of the blue button. At the same time, turn on an A/C switch under the fan switch, press it once, and the green indicator light will be displayed.
Precautions:
It is not advisable to turn on the warm air as soon as you get on the bus, because the water tank is still cold at this time. Turning on the warm air will not only slow down the temperature rise, but also increase the burden on the engine.
The correct way is to start preheating first, and then turn on the warm air after the engine temperature pointer reaches the middle position. At the same time, set the air circulation to external circulation, wait for 2 to 3 minutes, and then set the air circulation to internal circulation after the cold air in the car is discharged from the car.