Bomunik Turbo Coolant Return Line for BMW 740e/330e/530e — OE-fit single replacement hose

Bomunik's turbo coolant return line (ref. 11537643226 / 11538854735) is a direct-replacement hose designed to route used turbocharger coolant back into the BMW cooling system for select 740e xDrive, 330e and 530e models.

This replacement return line is manufactured to match the original equipment reference numbers and restore the turbocharger cooling circuit on compatible BMW plug-in hybrid models. It is sold as the single return hose only—supply lines, clamps, or the turbocharger unit are not included. Because cooling systems require correct fit and careful handling, a visual and part-number comparison is important before purchase and professional installation is recommended if you are not experienced with coolant-system service.

How do I confirm this hose fits my BMW?

Fitment varies by model year, engine type, and specific turbo plumbing, so comparing the reference numbers and physical shape is essential. Use the listed reference numbers and compare the hose ends, mounting bracket locations, and curve geometry to your vehicle's existing component.

• Check reference numbers: 11537643226 and 11538854735.
• Match vehicle: select 740e xDrive (2017–2019), some 330e and 530e variants.
• Visually compare hose shape, brackets and connection ends with your part.
• Confirm engine variant and model year before ordering.

What does this return line replace and what is included?

This listing supplies a single turbocharger coolant return line intended to replace the OEM return hose on compatible models. It is not a complete turbocharger kit and does not contain the coolant supply pipe, fasteners, or other cooling components unless specified by seller accessories.

• Includes: one turbocharger coolant return hose only.
• Excludes: coolant supply line, clamps, and turbocharger assembly.
• Inspect packaging and images to confirm included components before installation.

Can I install this myself, and are there special precautions?

Changing a turbo coolant return hose involves draining and refilling the cooling system and working near hot engine components—procedures that require mechanical knowledge and proper tools. If you are unfamiliar with coolant-system service or torque specifications, a professional technician is recommended to ensure leak-free installation and correct coolant circulation.

• Requires cooling-system service: drain, replace hose, and refill with correct coolant.
• Inspect hose routing and mounting brackets to prevent chafing or interference.
• Use new clamps and torque to manufacturer specifications where applicable.
• Pressure-test the system after installation to check for leaks.

Who is this for: This Bomunik return line is suited for BMW owners, independent mechanics, and repair shops maintaining compatible plug-in hybrid models (notably 740e xDrive 2017–2019 and select 330e/530e applications) who need a like-for-like replacement part. It’s ideal when the original return hose is leaking, swollen, cracked, or when replacing it as part of scheduled turbo or cooling-system maintenance. Verify fitment carefully and consider professional installation if you do not routinely service cooling circuits.