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Saves HP by Replacing Stock Fan Lightweight 1-piece plastic shroud with full-contact rubber seal mounts as a puller behind radiator; this rigid bracket system means no through-core mounting. Great cooling for 4x4s and higher horsepower applications. Increases mileage & water pump life. Fans have:
Adjustable thermostat
AC relay
Manual switch connection (#400-165 and #400-175 only)