The car air conditioner won't turn off, and I've encountered this issue several times before. There could be quite a few reasons for this. The most obvious one is a faulty control button—for instance, the switch button might be stuck or the contacts worn out, so when you press it, there's no response, and the air conditioner keeps running. Another possibility is a problem with the control panel, especially for electronic air conditioning systems. The circuit board inside might have short-circuited, preventing the signal from being sent, so even when you try to turn it off, it doesn't respond. Electrical issues are also common, such as a blown fuse or a faulty relay, which can cause continuous power supply, making it impossible to turn off the air conditioner. Then there's the control module—smart components like the ECU might have bugs, software conflicts, or hardware damage, preventing them from commanding the air conditioner to shut off. Mechanical problems aren't rare either, like a stuck fan or compressor, which keeps running non-stop. My suggestion is to start with the simplest checks: first, inspect the switch button and try pressing it repeatedly. If that doesn't work, check the corresponding fuse in the fuse box. If everything seems fine, then it's best to consult a professional mechanic to use a diagnostic tool to read the error codes. Don't delay too long, as it can drain the battery and increase fuel consumption.
