![]() ![]() If the evaporator temperature switch fails or has any issues that causes it to send an incorrect signal to the AC system, it can affect the system’s ability to produce cold air. One of the first symptoms of a potential problem with the evaporator temperature switch is no cold air from the AC system. Usually a bad or failing evaporator temperature switch will produce a few symptoms that can alert the driver of a potential issue that should be serviced. When the switch fails or has any issues, it can hinder the performance of the AC system and even cause it to malfunction. When the sensor detects that the temperature is approaching high temperatures, the AC system will increase flow through the system to increase cooling and will reduce flow when it detects that the evaporator is cold to conserve power and prevent it from freezing over. The switch is usually installed directly on the AC evaporator or in close proximity, and monitors the temperature of the evaporator so that it can be properly regulated to stay within reasonable operating temperatures. It is a part of the vehicle’s AC system, and as its name implies, detects and monitors the temperature of the AC system’s evaporator. The evaporator temperature sensor or switch is a component commonly found on many road going vehicles.
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