Motorcraft HVAC Heater Hose Assembly KH-571 fuel hose assemblies are designed using Ford Motor Company factory specs for precise fit finish and application suitability. Every Motorcraft HVAC heater hose assembly is manufactured from first-quality materials to help maximize chemical resistance and ensure performance across extreme temperatures. Reinforced wall design helps minimize heat loss. Backed by the Motorcraft Service Parts Warranty which offers 3 years and no commercial exceptions.