What are the symptoms of a faulty car evaporator temperature sensor?
2 Answers
A faulty car evaporator temperature sensor can easily damage the air conditioning system. Here is the relevant information: Function: The evaporator temperature sensor detects the temperature of the evaporator and regulates 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. Working Principle: The working principle of the evaporator temperature sensor is that after the air conditioning is turned on, 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 running. When the temperature meets the set requirement, the compressor circuit is disconnected, stopping the compressor. When the temperature rises above a certain level, the compressor circuit is reconnected.
Last time I was driving, the AC suddenly started blowing hot air and completely lost its cooling effect. At first, I thought it might be low on refrigerant, but after taking it to the repair shop for inspection, the mechanic said the evaporator temperature sensor was faulty. When this sensor fails, the evaporator can't regulate temperature properly, causing the AC system to automatically limit compressor operation. This leads to unstable air vent temperatures and sometimes even causes frost buildup on the evaporator surface - you might see mist coming from the vents and increased humidity inside the car, affecting driving comfort. If left unrepaired for long, the compressor may overwork or shut down completely, putting extra strain on the battery and potentially damaging the entire AC system. I was on the highway at the time, getting dizzy from the heat, and had to drive with windows down - really unpleasant. I'd recommend getting professional diagnosis promptly if you encounter similar issues. Replacing the sensor solves the problem and prevents further complications. You might also want to have AC components checked during routine car washes.
