Check the listing for details. Engine Cooling Fan Switch Standard TS-189. Condition: New. Listed at 11.89 USD. The Engine Cooling Fan Switch Standard TS-189 is a 12V relay designed for car and truck cooling systems. Manufactured by Standard Motor Products, this switch is specifically designed to control the fan operation in response to overheating. With the manufacturer part number TS-189, this product ensures reliable performance and compatibility with various vehicles. Ideal for maintaining proper engine temperature regulation, this cooling fan switch is an essential component for any vehicle's starter, alternator, ECU, and wiring system.