What is the reason why the car can hear the sound of water when the air conditioner is turned on?

What is the reason why the car can hear the sound of water when the air conditioner is turned on? What is the reason why the car can hear the sound of water when the air conditioner is turned on? The reason why the car can hear underwater sound when the air conditioner is turned on is that the engine coolant is insufficient and the central air conditioner hose falls off. The specific reasons and solutions are as follows: insufficient engine coolant: when the car is opened, the sound of water can be heard, which comes from the sound of water passing through the warm air tank. Check whether the engine coolant is insufficient. The solution is to add antifreeze first, and then step on the accelerator to exhaust. The hose in the central air conditioning section falls off: the sound of water can be heard when the car is empty. If it is empty, the steam will flow out of the car through the hose. Check whether the central empty hose falls off. The solution is to reinstall. @20 19