Walker Products 211-1024 Engine Cooling Fan Switch is precision manufactured from premium components in an ISO 9001-2008/TS16949 certified facility. It utilizes a changing electrical resistance value to measure the engine coolant temperature and relay this information to the temperature warning light (TIS) or gauge (CTS) on the dashboard. It is designed to provide outstanding performance and is manufactured to meet and exceed all Original Equipment Manufacturer (OEM) specifications and test requirements. Walker Products specializes in the engineering, manufacturing, and distribution of automotive engine management components. Walker is committed to meeting or exceeding the Original Equipment Manufacturer (OEM) or equivalent standards and specifications. This effort is backed by Walkers own manufacturing, product management and engineering expertise.