Coolant Hose Flange – 6Q0 122 291F (Dorman)

Description

The 6Q0 122 291F Coolant Hose Flange is a Dorman OE-style lower radiator hose connector. It mounts in the lower coolant circuit on Mk4-based VW and Audi vehicles. Specifically, it provides the sealed junction between the lower radiator hose and the engine’s cooling circuit. Furthermore, this flange features an integrated drain port. That port gives technicians a direct service point to drain the cooling system. Because of it, you can drain coolant without disturbing additional hoses or clamps. As a result, system service becomes faster and cleaner. The 6Q0 122 291F supersedes the earlier VAG OE references 1J0 122 291A and 1J0 122 291D, making it the current fitment for these applications.

Why the 6Q0 122 291F Coolant Hose Flange Fails Over Time

The 6Q0 122 291F mounts in the lower coolant circuit. Consequently, it endures constant hot coolant contact, sustained system pressure, and repeated thermal cycling. In particular, the lower hose position means coolant chemistry and pressure concentrate continuously at the hose barb and sealing surfaces. Over time, these stresses cause the plastic composite to become brittle. Hairline cracks then develop at the barb transitions and sealing face. Even a minor crack causes coolant seepage. As a result, low-coolant warnings appear and fluid levels drop without a visible external source. Therefore, replacing the 6Q0 122 291F promptly restores a tight, leak-free lower hose connection and returns the cooling system to proper operation.

Why Choose Dorman for the 6Q0 122 291F Coolant Hose Flange

Dorman is a leading OE-style replacement supplier with over a century of automotive experience. Moreover, their catalog specifically addresses Volkswagen and Audi applications across Mk4-era platforms. For the 6Q0 122 291F, Dorman engineers the flange to replicate the original VAG hose barb diameter, wall thickness, and drain port position. Additionally, Dorman selects plastic compounds rated for the thermal and chemical demands of a lower coolant hose environment. Therefore, the flange seals correctly with factory-style hose clamps and O-rings — without modification. Furthermore, Dorman backs the 627-002 with a limited lifetime warranty, providing long-term confidence for this repair.

Signs Your 6Q0 122 291F Coolant Hose Flange Needs Replacing

Catching a failing 6Q0 122 291F early prevents coolant loss and protects the engine from heat damage. Therefore, watch for these warning signs:

• Coolant weeping, staining, or dried mineral deposits around the lower hose connection or flange body

• Persistent low coolant warnings that require repeated top-ups without a visible leak elsewhere

• Sweet coolant odor from beneath the vehicle after engine warm-up

• Visible cracking, crazing, or surface discoloration on the plastic flange body

• Soft or poorly seating lower radiator hose at the flange barb

If any of these indicators appear, replace the flange promptly. Additionally, pressure-test the cooling system before returning the vehicle to service.

6Q0 122 291F Coolant Hose Flange — Key Features

• OEM Reference: 6Q0 122 291F (supersedes 1J0 122 291A / 1J0 122 291D)

• Brand: Dorman — OE-style European replacement supplier; Dorman 627-002

• OE-spec lower radiator hose flange for Mk4 VW/Audi applications

• Integrated coolant drain port for efficient, mess-free system service

• Precision-molded housing for correct hose barb fit and secure sealing

• Compatible with factory-style hose clamps and O-rings

• Direct-fit replacement — no modifications required

Service Notes for the 6Q0 122 291F Coolant Hose Flange

• First, drain the cooling system through the integrated port before removing the flange; this prevents coolant spillage and contamination of nearby components

• Next, inspect the lower radiator hose for softness, swelling, or surface cracking; replacing the hose and flange together avoids a return trip for the same symptom

• Also, install new hose clamps — reusing old clamps on a new flange is a common cause of slow seepage after installation

• Then, verify the drain port cap or plug is fully seated before refilling to prevent leaks at that fitting

• Finally, refill with VW/Audi-approved coolant (G12+/G13 per your owner’s manual) and bleed the system fully to purge air pockets before returning the vehicle to service

6Q0 122 291F Coolant Hose Flange — Compatibility & Applications

Always verify fitment by VIN before ordering. Multiple variants may exist within the same model year.

Cross Reference Numbers

• 6Q0 122 291F (VAG OEM — current)

• 1J0 122 291A / 1J0 122 291D (VAG OEM — superseded)

• Dorman 627-002

• Febi Bilstein 46154

• VAICO V10-9752

Additional information