Fan switch kit can be used in 12 or 24 volt applications Part Number: 0444 Air Tempreture Application. The Temperature Sensor is placed in the radiator fin section as close to the hot coolant inlet as possible, It senses air temperature as it passes through the radiator and has an adjustable temperature range of 40℃ to 110℃ (104ºF to 230ºF). Water / Coolant Application. The 0444 sensor can also be placed directly into the coolant system and no need to cut hoses. You need to use a Temperature Sensor Adaptor Kit (Part 0409) to assist with this type of fitment. It is recommended to install the sensor in the return hose from the radiator., Manufacturer: Akfldms