What are the symptoms of a faulty evaporator temperature sensor?

1 Answers
OIsabelle
07/29/25 9:16pm
The function of the evaporator temperature sensor is to detect the temperature of the evaporator and regulate the operating time of the air conditioning system. When the evaporator temperature sensor is damaged or fails, the temperature of the refrigeration system cannot be properly controlled. When the temperature reaches the set requirement, it disconnects the compressor circuit, causing the compressor to stop working. When the temperature rises above a certain value, it reconnects the compressor circuit. More details are as follows: 1. Working principle of the evaporator temperature sensor: After turning on the air conditioning, the evaporator continuously cools. When the temperature reaches the set value, it sends a signal to stop the compressor. If it continuously sends signals to the compressor, the compressor will keep working. When the temperature meets the set requirement, it disconnects the compressor circuit, stopping the compressor. When the temperature exceeds a certain value, it reconnects the compressor circuit. 2. Function: The evaporator temperature sensor serves to protect the air conditioning system by preventing frost formation on the evaporator surface, which would reduce heat exchange efficiency. Generally, a surface temperature of 2-4°C on the evaporator is considered the frost formation temperature, and this feedback is sent to the AC switch to control its on/off state. The high and low pressure switch signals are fed back to the vehicle ECU to control the compressor's on/off state. Both mechanisms are designed to protect the automotive air conditioning system.
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