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What are the symptoms of a faulty air conditioning thermostat in the Sylphy?

2 Answers

MacPaul

07/28/25 8:34pm

The following are the related symptoms of a faulty air conditioning thermostat in the Sylphy: 1. Intermittent air conditioning: A malfunctioning car air conditioning thermostat switch can cause the air conditioning to cool intermittently, or result in the air conditioning not cooling at all or not being cold enough. 2. Freezing: The car air conditioning thermostat switch has a temperature probe attached to the evaporator, mainly to prevent the evaporator from freezing and causing an ice blockage. If the car air conditioning thermostat switch is faulty, the air conditioning will continuously cool, leading to the evaporator freezing. Once the evaporator freezes, cold air cannot be blown out of the vents. 3. Circuit issues: Under normal circumstances, the two wires of the car air conditioning thermostat switch form a closed circuit. The temperature probe attached to the evaporator prevents ice blockage and ensures airflow. When the surface temperature of the evaporator drops to a certain level (usually set at 3 degrees), the two wires form an open circuit, causing the compressor to stop running, and the evaporator temperature will no longer drop.

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JosephAnn

08/12/25 1:19am

If the air conditioning thermostat of the Sylphy malfunctions, the typical symptoms first manifest as temperature control failure. For example, you set it to cool at 25°C, but the air blowing out from the vents is still extremely cold, feeling like below 10°C, or conversely, it doesn't cool at all, continuously blowing hot air which is uncomfortable. The fan speed also becomes unstable, fluctuating between fast and slow, and sometimes it keeps running even after you press the off button. This is usually due to a faulty temperature sensor that cannot accurately read temperature signals, causing the air conditioning system to receive confused commands. In more severe cases, the air conditioning may not start at all, without even making a sound. I've noticed that such issues often occur in older models, like Sylphys over 5 years old, frequently caused by sensor aging or circuit board corrosion. Don't underestimate this problem—during the scorching summer, when the car's interior temperature can't be lowered, it significantly affects driving safety. Therefore, I recommend not tinkering with it yourself but instead taking it directly to a professional repair shop to check the sensor and wiring connections. Simply replacing it with an original factory part should suffice.

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