Why Can't the Air Conditioning Be Turned Off?
3 Answers
Here are the reasons why the car air conditioning cannot be turned off and the corresponding solutions: 1. The air conditioning switch button is damaged. Solution: Replace the button. 2. The car air conditioning thermostat is damaged. Solution: Replace the thermostat. 3. The switch contacts are stuck. Solution: Check the switch. 4. The switch circuit is faulty. Solution: Check the circuit. 5. Poor switch contact. Solution: Re-plug and fix it. Below is an introduction to the internal and external circulation of car air conditioning: 1. External circulation: The external circulation mode uses a fan to draw air from outside the car into the interior, allowing airflow between the outside and inside of the car. The air blown by the fan comes from outside the car, and even if the fan is not turned on, airflow is still drawn into the car while driving, replenishing fresh air inside the car. 2. Internal circulation: The internal circulation mode closes the airflow passage between the inside and outside of the car. Without the fan, there is no airflow circulation. When the fan is turned on, the airflow drawn in comes only from inside the car, creating an internal airflow circulation within the vehicle.
Last time when my car's air conditioning couldn't be turned off, it really stressed me out. The reasons can be quite varied. The most common issue is the control button getting stuck or worn out—when it's not operating smoothly, it might get jammed in the 'on' position. Electrical problems shouldn’t be overlooked either, such as a blown fuse or a short circuit in the wiring, which can interrupt signal transmission and cause the system to mistakenly think it needs to keep running. Relay failure is another major factor, especially in older vehicles where relays can get stuck and fail to cut off power. When diagnosing, I usually start with the simplest checks, like ensuring the buttons move smoothly, then use a multimeter to test the fuse condition. If I can’t fix it myself, I head straight to a professional repair shop—keeping the AC running continuously not only wastes fuel but can also drain the battery, compromising driving safety. Regular maintenance, like keeping the control panel clean, is very helpful.
The issue of car air conditioning not turning off is quite common in my repair experience. Typically, it's due to poor contact in the control panel switch, where oxidized contacts prevent the signal from resetting. Relay problems are also frequent, with internal components sticking or coil failures causing continuous power supply. Additionally, when the system control module is damaged, program errors can cause the air conditioning to stay on automatically. I once handled a case where the owner's improper wiring modifications caused a short circuit, leading to the malfunction. Recommended inspection steps include first observing button responses, testing if relay contacts move smoothly, and simultaneously checking circuit voltage to prevent excessive current from damaging components. Safety first—if you encounter issues while driving, stop immediately to inspect and avoid risks like fan jams causing overheating.
