Your vehicle’s heater hose is responsible for carrying liquid coolant to and from the engine, radiator, and heater core. The timing belt in your vehicle’s engine keeps the opening of the valves timed with the motions of the pistons (which move up and down to spin the engine’s crankshaft) so they don't interfere with each other. By neglecting belts & hoses auto repair, you decrease the longevity of your vehicle, lowering its resale value if not addressed.