ACM Viscous Fan Drives offer the latest in engineering innovations, including fully modulating, cost-effective fan drives that control fan speed in direct proportion to engine cooling needs. ACM Viscous Fan Drives are the economical choice for efficiency, performance and quiet operation. Product Features:Fan operates only when required and at appropriate speed - Allowing for improved efficiency and possible fuel and horsepower savings of up to 6-10% over fixed fans.Self-contained unit - No maintenance needed, nothing to service of maintain.Improved temperature control and smooth, soft fan engagement - Allowing for extended engine, belt and accessory component life.Bimetallic sensor - Senses heat exchanger air temperature for accurate fan engagementNo external controls required - Simplicity of design for improved reliability
