Original BMW Radiator and Engine Return Hose for BMW 340i, 340i GT, and 440i (2016–2020)

The Original BMW hose for radiator and engine return is a coolant hose that links the radiator and the engine return circuit on B58-powered BMW 340i and 440i models from 2016–2020. BMW began producing this number in July 2015. The finished hose weighs 223 grams and is made in Hungary. A cooling hose in this circuit carries hot coolant on every drive, and the rubber slowly breaks down with age and heat. Watch for visible cracks on the hose surface, rubber that has gone soft, coolant seeping where the hose connects, a coolant smell under the hood or in the cabin, or a coolant level that keeps dropping.

Original BMW Parts carry a 24-month parts warranty.

BMW applies this hose to the B58 six-cylinder in the facelifted F30 3 Series sedan, the F34 3 Series Gran Turismo, and the F32, F33, and F36 4 Series. Every application BMW shows for this number uses the B58 engine. BMW sells it as a single piece. Many parts counters call it a heater hose, while BMW's own name for it is the hose for radiator and engine return, so expect to see both names when comparing part numbers.

Technical Details

• Manufacturer: BMW (Original BMW part)
• Part number: 64-21-9-329-649
• BMW part name: hose for radiator and engine return
• Engine: B58 six-cylinder
• Weight: 223 g (0.5 lb)
• Production start: July 2015
• Made in Hungary
• Sold individually as one piece
• Warranty: 24 months

Common Questions

Does the 440i xDrive Gran Coupe use the same hose as the 340i GT xDrive?
Yes. BMW uses this one number across the F30, F34, F32, F33, and F36 cars covered here, all with the B58 engine.

Why does a worn hose matter beyond a small leak?
Heater and coolant hoses are part of the engine cooling system, and keeping them in good condition helps prevent overheating.

Fitment & Compatibility

Use the fitment table below to confirm year, make, model, submodel, and any notes tied to your exact vehicle. Pay close attention to engine, chassis, position, and option-specific details before ordering. With over 20 years of parts and fitment experience, PMB Performance can match this to your VIN.