What are the reasons for intermittent cooling failure in Audi A3's air conditioning?
2 Answers
The cooling failure may be caused by the tripping of the compressor protection device. The overload protection of the compressor trips when the system's high pressure is too high or the current is excessively hot. Reasons and solutions for excessively high pressure and overheating: Excessive refrigerant. Appropriately reduce the refrigerant amount. Poor heat dissipation. Check for dust on the condenser tubes and clean the condenser. Blockage in the pipeline system. Refer to the pressure gauge for judgment and resolution, reinstall the evaporator or clean the dust and scale on the filter. Reduced airflow, imbalance in system pressure and temperature, clean the evaporator or filter. Lack of fluorine is also possible. When fluorine is lacking, the compressor's exhaust temperature becomes too hot, causing the overload protection switch to trip. Issues related to the electrical circuit include: Failure of the control circuit board. Overload of the temperature sensor, leading to incorrect information.
After driving the Audi A3 for so many years, the air conditioning sometimes cools and sometimes doesn't. The problem often lies in refrigerant leaks or small air bubbles in the system. If the compressor is worn out and operates unstably, it may interrupt cooling; or if the condenser fan is stuck and cannot dissipate heat, it may cause the system to temporarily shut down for protection. Evaporator icing is also a common cause, especially when the temperature is set too low, blocking airflow. Additionally, if the filter is dirty, poor airflow can also affect cooling efficiency. In such cases, don't rush to repair it immediately—pause for a few minutes to let the system restart. If the issue persists, take it to a shop to check the refrigerant level and sensor status. Regular maintenance of the air conditioning system can prevent problems, such as refilling refrigerant every two years and cleaning the filter.
