Why is the car's recirculation button not responding?

[LeEmmanuel]

The reason the car's recirculation button is not responding is that when the air conditioning's airflow adjustment knob is in the windshield defrost mode, the recirculation will automatically turn off. Below are the pros and cons of recirculation: 1. Pros: Recirculation mainly prevents external dust and harmful gases from entering the car in a timely and effective manner, such as when driving through smoke, dust, areas with strong odors, or in heavy traffic, blocking harmful exhaust emissions from the vehicle ahead. Recirculation can enhance the cooling and heating effects of the air conditioning and provides better insulation. 2. Cons: Prolonged use of recirculation can reduce the air quality inside the car, potentially causing dizziness or discomfort. It is advisable to use recirculation for a while and then switch to fresh air mode for a few minutes to allow fresh air into the car and improve air quality.

[VanAlejandro]

I also encountered the issue of the recirculation button not working last time, and it was extremely frustrating. Actually, the most common cause of this problem is poor contact in the button itself, especially in cars that have been used for several years—the metal contacts inside the button may have oxidized or accumulated dust, preventing the signal from being transmitted. Another possibility is that the connector behind the air conditioning control panel has come loose. If you’re handy, you can remove the center console panel and check the connector. Also, don’t overlook the fuse—locate the corresponding air conditioning fuse in the engine compartment’s fuse box, usually labeled 15A or 20A, and replace it if it’s blown. If none of these are the issue, it’s likely that the recirculation flap motor is stuck or there’s an electrical fault, in which case you’ll need to visit a repair shop to read the fault codes with a diagnostic tool. It’s best to clean the air filter regularly to prevent the flap from getting stuck by debris.

[LaAngelina]

With over a decade of experience in auto repair, I've handled hundreds of cases of AC recirculation failure. First, check the button indicator light - if it's completely off, there's an 80% chance the button assembly is faulty and the entire switch panel needs replacement. If the light is on but ineffective, focus on inspecting the flap motor and linkage mechanism. In older cars, linkages are prone to rust and jamming, while newer vehicles often suffer from motor burnout. Here's a handy trick: pop the hood, locate the AC air intake, have someone press the recirculation button inside the car while you listen for flap movement sounds. No noise usually confirms an actuator issue. A word of caution to car owners: don't randomly disassemble air ducts - the plastic components inside are extremely brittle. Last time, a customer snapped a flap linkage, doubling the repair costs instantly.