Original BMW Coolant Supply Hose, Engine to Heat Exchanger, for BMW X3 and X4 (2011–2018)

Hot coolant reaches the cabin heater on the BMW X3 and X4 through this Original BMW coolant supply hose, part number 64-21-9-179-582, which carries coolant from the engine to the heater core on 2011–2018 F25 X3 and F26 X4 models. BMW places it in the engine to heat exchanger group, so it is the feed side of the heater circuit. The hose weighs 454 g, production began in September 2010, and it is made in Mexico. It is sold as one piece.

Original BMW Parts carry a 24-month parts warranty.

Heater hoses circulate engine coolant through the heater core in the dashboard, where the blower moves air across it to warm the cabin, and they also form part of the engine cooling circuit. Coolant hoses for the heater core can deform with age and repeated heating and cooling cycles. Signs of a failing hose include cracks on the surface, leaks at the connections, rubber turning soft, a falling coolant level, a coolant smell under the hood or in the cabin, no heat from the vents, and visible coolant near the firewall connections. BMW uses this single supply hose across N20, N52N, and N55 engines in these two SUVs, which simplifies ordering for mixed fleets of the same platform.

Technical Details

• Manufacturer: BMW
• Part number: 64-21-9-179-582
• BMW part name: coolant hose, supply
• Group: engine to heat exchanger
• Weight: 454 g
• Production start: September 2010
• Chassis: F25 and F26
• Made in Mexico
• Warranty: 24-month Original BMW Parts warranty

Common Questions

Is this the supply or return hose?
BMW identifies it as the supply hose, feeding coolant from the engine to the heater core.

Why would a heater hose need replacing?
Heater core hoses can deform with age and constant heating and cooling cycles, leading to cracks, softness, or leaks at the connections.

Fitment & Compatibility

Use the fitment table below to confirm the exact year, make, model, submodel, and any application notes before ordering. With over 20 years of parts and fitment experience, PMB Performance can match this to your VIN.