This hose connects from the hard coolant line underneath the intake manifold back to the heater valve. Over time, rubber hoses can become hard, with the internal walls covered in sediment and the plastic fittings turning brittle or the internal o-rings simply leaking. A must replace hose for any E46 3-Series owner looking to preventively maintain or restore their cooling system. We've found these Febi hoses to be great quality, and are manufactured by an original equipment supplier using genuine plastic hose connectors.

Part Number: 64218376999
Rein Part Number: CHH0158R