My Artz turns on the automatic air conditioner. Why is it so smelly?

Although it is not a common phenomenon that air conditioning odor is caused by water leakage in the heater box, it is not the only situation that needs welding treatment. At the same time, it is necessary to supervise 4S to fill anti-collision sponge between the heater tank and the water pipe to avoid possible collision and wear between the pipes due to bumps during driving.