0-120°C Temperature Control Thermostat Radiator Fan Switch Universal Auto Parts Condition: Item Type: Thermostat Switch Material: ABS Color: As picture shown Application: Universal type, suitable for any aftermarket cooling fan Installation: To install on a hose, simply remove the top heat sink and fully insert the probe, then reinstall the hose and tighten on the capillary wire, taking special care not to damage the inside of the probe. If needed, silicone sealants can help seal. Wiring Instructions: C Terminal: 12V feed No2 Terminal: Fan power off (The switch connects to ground through the fan) No1 Terminal: Leave blank, this application does not need this You can also connect a relay if you like, but this is not required.