If the AC compressor in your car keeps running even after the interior temperature has reached the set point (e.g., 25°C), there could be several reasons for this behavior:
Incorrect Temperature Setting: Double-check to ensure you have set the temperature correctly. Sometimes, users may inadvertently set the temperature lower than intended, causing the AC system to keep running to reach the lower temperature.
Thermostat Issues: The thermostat in your car's AC system is responsible for sensing the interior temperature and signaling the compressor to turn on or off. If the thermostat is faulty or malfunctioning, it may not accurately detect the temperature, leading to continuous operation of the compressor.
Refrigerant Leak: If there is a refrigerant leak in the AC system, the compressor may not receive the appropriate pressure signals, causing it to run continuously. Low refrigerant levels can also hinder the system's ability to reach the desired temperature, leading to non-stop operation.
Faulty Compressor Clutch: The AC compressor is equipped with an electromagnetic clutch that engages and disengages to control the compressor's operation. If the clutch is malfunctioning or stuck, the compressor may remain engaged continuously.
Electrical Issues: Electrical problems, such as faulty relays, switches, or wiring, can disrupt the communication between the AC control system and the compressor, causing it to run without proper regulation.
Blocked or Restricted Airflow: Obstructions in the air intake or clogged cabin air filters can limit airflow, preventing the interior from cooling down adequately and keeping the compressor running.
To diagnose and resolve the issue, it's best to take your car to a qualified mechanic or an automotive service center. They will be able to conduct a thorough inspection of the AC system, check for any error codes, and perform the necessary repairs to ensure the AC compressor operates as intended, reaching and maintaining the desired temperature inside the car.