2015 Tiffin Allegro Bus

THIS IS NOT A SINGLE ISOLATED INCIDENT. THERE HAVE BEEN A LARGE NUMBER OF OWNERS WITH THIS ISSUE AND THE MANUFACTURER HAS NOT PROVIDED AN ACCEPTABLE SOLUTION. *DT ON THE 2015-2018 TIFFIN ALLEGRO BUS ON THE POWER GLIDE CHASSIS, A CRITICAL DESIGN DEFECT EXISTS WITH THE ENGINE FAN DRIVE TENSIONER BRACKET AND TENSIONER PULLEY ASSEMBLY. THE FAN DRIVE IS DESIGNED TO ENGAGE AT A PRE-DETERMINED ENGINE COOLANT TEMPERATURE AND IS UTILIZED TO LOWER ENGINE TEMPERATURE AS THE ENGINE COOLANT TEMPERATURE REACHES A HIGH LEVEL. THE TENSIONER BRACKET IS CONSTRUCTED FROM HEAVY GAUGE STEEL PLATE THAT IS WELDED TOGETHER AND THE TENSIONER PULLEY ASSEMBLY IS A CAST/MACHINED ALUMINUM ASSEMBLY. THE ASSEMBLY WEIGHS OVER 20 POUNDS. AS DESIGNED, THE FAN DRIVE TENSIONER ASSEMBLY CANNOT SUFFICIENTLY HANDLE THE TORQUE AND VIBRATION GENERATED WHEN THE FAN DRIVE ENGAGES. THE TENSIONER BRACKET AND PULLEY DEVELOPS MICRO-CRACKS THAT QUICKLY DETERIORATE INTO MAJOR CRACKS IN THE STEEL BRACKET AND TENSIONER PULLEY CAUSING A SUDDEN TOTAL FAILURE OF THE BRACKET, WHICH IN A WORSE CASE SITUATION, RESULTS IN THE BRACKET BREAKING INTO SEVERAL PIECES AND BECOMING DISCHARGED FROM THE REAR OF THE MOTORHOME AT HIGHWAY SPEEDS. WHEN THE BRACKET FAILS, THE ENGINE FAN DRIVE IS INOPERABLE, AND THE MOTORHOME OPERATOR EXPERIENCES A RAPID INCREASE IN ENGINE TEMPERATURE AND THE ENGINE SHUTS DOWN, POSSIBLY CAUSING A LOSS OF VEHICLE CONTROL.. SHOULD THE FAN DRIVE TENSIONER AND TENSIONER BRACKET BECOME DISLODGED FROM THE MOTORHOME ENGINE COMPARTMENT, IT COULD STRIKE ANOTHER VEHICLE OR PERSON CAUSING SEVERE DAMAGE, INJURY, OR POSSIBLE DEATH. TO DATE THE MANUFACTURER HAS BEEN UNABLE TO DESIGN/PROVIDE A FAN DRIVE TENSIONER ASSEMBLY THAT WILL WITHSTAND THE TORQUE AND VIBRATION BEING GENERATED. THE MANUFACTURER SHOULD IMPLEMENT A RECALL OF THE FAN DRIVE TENSIONER BRACKET AND TENSIONER PULLEY ASSEMBLY,