How to Check the Car Air Conditioning Controller?
3 Answers
The method to check the car air conditioning controller is: 1. First, check whether the refrigerant is sufficient. 2. View the usage status of the refrigerant through the glass observation hole on the liquid storage dryer in the engine compartment. 3. If a large number of bubbles appear in the observation hole after the air conditioning is started, it means the refrigerant is insufficient. Extended content: 1. The car air conditioning device, referred to as car air conditioning, is used to adjust and control the temperature, humidity, air cleanliness, and air flow inside the car compartment to the optimal state. It provides a comfortable riding environment for passengers, reduces travel fatigue, creates good working conditions for the driver, and plays an important role in ensuring safe driving. 2. It generally includes a refrigeration device, heating device, and ventilation device. This combined device makes full use of the limited space inside the car, with a simple structure and easy operation.
My car's air conditioning controller suddenly stopped working, so I decided to inspect it myself. First, I tested if all the buttons responded, such as the fan speed adjustment, temperature control, and mode switching. If the buttons didn't respond, it might be due to worn or dirty internal contacts, so I gently cleaned the contact points with a cotton swab dipped in alcohol. Then, I checked the fuse box to locate the fuse related to the air conditioning circuit (usually labeled AC). If the metal wire inside was broken, it meant the fuse was blown and needed to be replaced with one of the same specifications. Next, I inspected the wiring harness connector—loose or corroded plugs at the back of the controller could affect the current, so I reconnected them firmly. Finally, if the controller was electronic, I disconnected the negative terminal of the battery for a few minutes to try resetting it. The whole process was simple, but I had to be careful about static electricity and avoid operating while driving. A blown fuse is the most common issue, and replacing it usually solves the problem, saving on repair costs. If the issue persists, it's best to take the car to a professional shop for diagnosis rather than forcing it and risking damage to the system.
Checking the car's air conditioning controller is quite simple, let me walk you through the routine steps. First, start the engine and turn on the AC to test if all function buttons work properly, such as lowering the temperature or switching to external circulation mode with no response. If buttons are stuck or unresponsive, it might be switch damage or dust buildup—try cleaning them. Next, open the fuse box, typically located in the engine compartment or under the dashboard, locate the AC fuse, and check if it's blown or blackened. Replace it with a new fuse and restart the car. Don’t forget to inspect for loose or aged wiring connections, as these can easily cause short circuits. Additionally, if the internal PCB board of the controller is corroded, it may affect performance—remove the casing and gently brush off any deposits. Always avoid wet hands during the process and wear insulated gloves for safety. While DIY checks can catch issues early, complex faults like a faulty control module should be handled by a technician to avoid improper repairs.
