Original BMW Auxiliary Coolant Pump Supply Hose for BMW 530i, 540i, 640i xDrive Gran Turismo, and 740i (2016–2019)

Part number 64-21-9-317-614 is the Original BMW coolant supply hose that BMW places at the auxiliary coolant pump on the engine, used in the heater circuit of the G30 5 Series, the G32 6 Series Gran Turismo, and the G11 7 Series. Heater hoses carry hot coolant from the engine to the heater core inside the dashboard, where the blower pushes cabin air across the core to warm it. A leak here affects cabin heat and also lets coolant escape from the engine's cooling system. BMW names this part coolant hose, supply 1. The hose weighs 113 g (0.2 lb), is sold individually, and is made in Poland. Production of this number began in July 2015.

Original BMW Parts carry a 24-month parts warranty.

BMW routes several hoses around the auxiliary coolant pump, and this one carries the supply 1 designation. Match it to that position on your engine instead of ordering by the general term heater hose. BMW shares this single number across the B46 and B48 engines in the 530i and the B58 engine in the 540i, 640i xDrive Gran Turismo, and 740i, so engine choice within those models does not change the part.

Technical Details

• Manufacturer: BMW
• Part number: 64-21-9-317-614
• BMW name: coolant hose, supply 1
• Position: auxiliary coolant pump, engine side
• Sold as: one hose
• Weight: 113 g (0.2 lb)
• Production start: July 2015
• Made in Poland
• Warranty: 24 months on Original BMW Parts

Common Questions

What are the signs of a failing heater hose?
Look for cracks, rubber that feels soft, leaks at the connections or near the firewall, a dropping coolant level, or a coolant smell under the hood or in the cabin. Little or no heat from the vents can also mean the heater core is not getting enough hot coolant.

Does the same hose fit the xDrive versions?
Yes. BMW uses this hose on both the rear-drive and xDrive versions of the models above.

Ask PMB about the rest of the cooling hoses around your G-chassis auxiliary pump.

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. PMB Performance can confirm this against your VIN, backed by more than 20 years of parts and fitment work.