New thermal sensor switch for your 1997 Polaris Sportsman 400L ATV. This little guy screws into your engine to help control the cooling fan – when things heat up, it tells the fan to kick on. It’s made by Caltric, matches OEM numbers like 4110225, and is built from metal with a blade/bullet connector for easy wiring. The sensor itself is about 39.7mm long and 22mm wide, and it comes with a 90-day warranty. It’s made in China, designed as a direct screw-in replacement, and requires no programming or special tools. If your fan’s not coming on like it should, this sensor could be the fix. Just make sure your model and year match before ordering.