Why Is There a Water Flowing Sound When the Car Air Conditioner Is On?

[AlexaMarie]

When the car air conditioner is turned on, you can hear the sound of water, which is caused by water passing through the heater core. Check if the engine coolant is low. In this case, you can first add antifreeze, then press the accelerator a couple of times to let the engine run at high speed to expel some air. Below are the reasons for the water flowing sound when the car air conditioner is on: Low Coolant Level: The sound of water when the car air conditioner is on is caused by water passing through the heater core. Check if the engine coolant is low. In this situation, you can first add antifreeze, then press the accelerator a couple of times to let the engine run at high speed to expel some air. Insufficient Antifreeze: When the air conditioner is on, the circulation path of the antifreeze changes. If the antifreeze is insufficient or there is air in the antifreeze, it may also cause abnormal sounds. You can perform an antifreeze bleeding operation after ensuring that the antifreeze is sufficient.