If your air conditioning compressor shuts off after running for approximately 5 minutes, several possible causes could be responsible for this behavior. Here are a few potential reasons:
Refrigerant leak: The most common cause of an AC compressor shutting off prematurely is a refrigerant leak. If there is a leak in the AC system, it can lead to a low refrigerant level. When the refrigerant level drops below a certain threshold, the compressor has a safety mechanism that shuts it off to prevent damage. This issue requires a professional inspection and repair to locate and fix the leak and recharge the refrigerant.
Overheating compressor: An overheating compressor can cause it to shut off automatically. Several factors can contribute to compressor overheating, including restricted airflow, a malfunctioning cooling fan, or a faulty compressor clutch. If the compressor is getting too hot, it may shut off to prevent damage. A qualified technician can diagnose and resolve this issue.
Electrical problem: Electrical issues, such as a faulty relay or sensor, can cause the compressor to shut off unexpectedly. Electrical malfunctions can disrupt the power supply to the compressor or send incorrect signals, leading to its shutdown. An experienced technician can perform electrical diagnostics to identify and rectify the problem.
System pressure abnormalities: AC systems have pressure sensors that monitor the high and low pressures in the refrigerant circuit. If there is an abnormal pressure reading, such as excessively high or low pressures, the compressor may shut off as a safety precaution. This can be caused by issues like a faulty pressure sensor, a clogged expansion valve, or a malfunctioning pressure relief valve.
These are just a few potential causes for the compressor shutting off after a few minutes. It's best to have a professional automotive technician inspect and diagnose the issue to accurately identify the underlying problem and perform any necessary repairs.