Why does the car make a hissing sound like air leakage when the air conditioner is turned on?
1 Answers
Car makes a hissing sound like air leakage when the air conditioner is turned on, possibly due to insufficient refrigerant. Below are some explanations about car air conditioners: 1. Lack of refrigerant or leakage: Most cases of insufficient cooling are due to a lack of refrigerant. You can first check the air conditioner pressure. If both high and low pressures are low, it is basically due to insufficient refrigerant, and you just need to add refrigerant to reach the appropriate pressure. 2. Excessive pressure in the air conditioning system: The car air conditioning system has its own pressure because the compressor is pressurizing it. When too much refrigerant is added or there is a blockage in the pipeline, the system pressure can become too high. In this case, the control system will disconnect the compressor's electromagnetic clutch to stop the compressor. The solution is simple: after confirming that the pressure exceeds the standard, release some refrigerant to restore normal pressure. 3. Damaged evaporator temperature sensor or pressure switch: The evaporator, also called the evaporator box, is located in the air duct under the dashboard. The refrigerant vaporizes here, absorbing heat and producing low temperatures. When the airflow passes through the small channels on the evaporator, it is cooled. When the temperature approaches the frost point, the compressor stops. If this sensor is damaged and frequently gives false alarms about approaching the frost point temperature, the compressor will stop frequently.
