The Genuine BMW HVAC Heater Hose - 64217836988 is a high-quality, OEM replacement part for BMW vehicles. This hose is responsible for carrying hot coolant from the engine to the heater core, which then heats the air for the vehicle's heating system. It is made from durable materials and designed to fit perfectly in BMW models. This heater hose is an essential component for maintaining proper heating and cooling performance in your BMW.