S & HTS FAN CLUTCH The hub bearing assembly makes the S & HTS perfect for high run time applications.  On the piston friction disc (PFD) of the S & HTS is the System Sentry™. The System Sentry™ protects the fan drive and the entire cooling system. This patented device reacts to heat build up caused by fan drive slippage or fan obstructions.  When it senses excessive heat, the System Sentry™ releases, disengaging the fan drive before extensive damage occurs to the cooling system. Finally, a new longer life air cartridge is included in the high performance S & HTS fan drive. This cartridge reduces the possibility of air leaks with its long life carbon tip and double o-ring air seal. The technologically advanced bearing assembly design, PFD with System Sentry™ and new cartridge, combine to provide you with a premium on/off fan drive that will perform consistently under extreme conditions. Benefits Long service life Ideal for harsh environments Consistent performance Better protection against heat damage Features System Sentry Long-life air cartridge Double O-ring air seal Applications Heavy-duty trucks Related Products Advantage Reman Fan Drives & Genuine Horton Repair Kits HT/S PolarExtreme Reman Fan Drives & HT/S or S Repair Kits WindMaster Fans HG300 Solenoid Valves S & HTS Parts & service manual Master Horton Fan Clucth Listing Fan Clutch Selection Criteria Form .pdf Maintenance & Repairs Video RELATED PRODUCTS Horton Windmaster Fans NGC Fans