Additionally, the CoolFlow Fan is almost invisible when mounted on the motorcycle, and features switched On/Off/Auto operation. In the On mode, the fan is active at low speeds, and will turn off when motorcycle speed reaches 40 mph. As speed lowers, the fan turns back on at 35 mph; this gap is intentional to prevent the fan from cycling on and off when riding close to 40 mph. In the Auto setting, the fan operates based on a combination of slow vehicle speed and specific engine and ambient temperatures. Fan function is indicated in the odometer. The CoolFlow Fan is waterproof and designed for durable performance. A dealer Digital Technician update (priced separately) is required to complete the installation, and installation on some models may require additional components. There is a CoolFlow Fan designed specifically for each 2017 Harley-Davidson Touring and Trike model motorcycle. See an authorized Harley-Davidson dealer for fitment details.