What is the reason why the Chery windshield defogging button cannot be turned off?
2 Answers
If it cannot be turned off, the switch may be damaged. It is recommended to check at a 4S shop whether the switch is internally damaged or if there is a short circuit in the wiring. Below are the reasons for car window fogging: 1. Reason one: When the air humidity is constant, if the window temperature is lower than the dew point temperature, condensation will form on the window surface, which is the commonly seen phenomenon of fogging on the front windshield. 2. Reason two: When there is a certain temperature difference on both sides of the window, and the saturated vapor pressure of water on the surface with lower temperature is lower than the surrounding environment's vapor pressure, water vapor will gather on the glass surface, forming tiny water droplets that seep out and create fog. If the dew point temperature is above zero degrees Celsius, fogging occurs; if it is below zero degrees Celsius, frost forms.
When driving my Chery car, I encountered an issue where the defogging button couldn't be turned off. The button itself might be stuck or have poor contact, especially in winter when dust accumulates inside or it freezes, preventing it from springing back to its original position. Wiring faults, such as loose connectors or short circuits, can send incorrect signals, causing the system to keep running. If there's a bug in the control module, it might misinterpret commands, forcing the defogging mode to stay on. A stuck fan in the air conditioning system or a faulty sensor that mistakenly detects fog inside the car can also keep the defogging activated. I recommend checking if the button springs back flexibly when pressed manually or cleaning dust around its edges; restarting the vehicle can sometimes reset the system effectively. If that doesn't work, a professional repair shop should use diagnostic tools to check the circuit or update the software to avoid safety hazards affecting driving visibility. Regularly maintaining good ventilation and dryness inside the car can help reduce fogging triggers.
