What are the reasons why the car air conditioner cannot be turned off?
2 Answers
Car air conditioner cannot be turned off due to: 1. The switch button of the car air conditioner is broken; 2. The thermostat of the car air conditioner is broken; 3. Switch contacts are stuck; 4. Switch circuit failure; 5. Poor switch contact. Car air conditioning refers to the air conditioning device installed in the car, which can cool, heat, ventilate and purify the air in the compartment, providing a comfortable riding environment for passengers, reducing the driver's fatigue and improving driving safety. Car air conditioning generally includes refrigeration devices, heating devices and ventilation devices. This combined device makes full use of the limited space inside the car, with a relatively simple structure and easy operation.
A few days ago, I encountered a car with an air conditioning system that couldn’t be turned off during a repair, and the owner was quite anxious. The main issue was in the control circuit. The most common problems are the air conditioning panel buttons getting stuck or the contacts beneath the buttons sticking, preventing the power-off signal from being sent. Another common issue is with the relay; if the relay contacts are burnt out, they can remain closed and keep the power on. I recommend checking these two areas first—use a screwdriver to gently tap the control panel and listen for any loose parts inside. If that doesn’t fix it, then the control module needs to be examined. Nowadays, most cars use a body control module to manage the air conditioning, and if that’s faulty, the only solution is to replace the module. It’s best to address this quickly, as leaving the air conditioning on indefinitely can drain the battery completely.
