construction: The air conditioner pressure sensor switch is made of aluminum and plastic, providing waterproof, dustproof, sunproof, and wearresistant durability. It resists damage and deformation and stays securely in place. It is designed to withstand varied weather conditions and offers a long service life. Compatibility and specifications: Compatible with 530E (20182019) and 530I (20022018). Air Conditioner Pressure Switch part numbers include 64539141957, 64530141211, and 64539323658. Practical function: The air conditioner refrigerant pressure switch sensor detects the pressure inside the car air conditioner, improves and optimizes control of the air conditioning system, helps prevent compressor damage from abnormal pressure, and works with other system functions to control the refrigeration process. Easy installation: Simple and reliable installation. No need to lift or modify the vehicle—install it where needed. Before installation, ensure the electrical connection is clean and dry. Disconnect the electrical connector, remove the old sensor, and it with the one. Use scenarios: a worn sensor on compatible BMW models to restore accurate A/C control. Use during preventive maintenance to prevent compressor damage from abnormal pressures. Diagnose irregular A/C performance (such as abnormal cycling or pressure readings) and restore proper refrigeration system control.