ITEM NAME:175 185 Degree Engine Cooling Fan Thermostat Temperature Switch Sensor Relay Kit 175 185 Degree Engine Cooling Fan Thermostat Temperature Switch Sensor Relay Harness Kit SPECIFICATIONS.(1)Mount the relay under the hood in a convenient location as to the fan as possible. 1) 175-185 degree electric fan thermostat relay switch kit for your cooling system, it is a 3/8" pipe thread. 4) This kit is set up to turn your electric fan on at 185 degrees and shut off at 175 degrees and will work with any 12 volt system.