Coolant Hose Connector – 7M3 122 291 (OE)

The 7M3 122 291 is a Genuine Volkswagen/Audi OE part engineered to factory specifications for material grade, wall thickness, hose port diameter, and sealing surface geometry. Moreover, aftermarket connectors often use lower-grade plastics that crack sooner under the sustained thermal stress of the cooling circuit. Therefore, choosing an OE part ensures the 7M3 122 291 withstands the same heat cycling and coolant chemistry the factory originally designed it for. Furthermore, the OE port tolerances ensure factory-spec hose clamps and O-rings seat correctly, eliminating the fitment gaps that commonly cause slow seepage after aftermarket installations. Additionally, the OE specification notes that this part cannot be reused or reinstalled after removal — so always install a new unit to guarantee a proper seal from the first startup.

Signs Your Coolant Hose Connector Needs Replacing

Catching a failing 7M3 122 291 early prevents coolant loss and protects the engine from overheating. Therefore, watch for these warning signs:

• Visible coolant weeping, staining, or dried deposits around the right-side hose junction or nearby coupling connections

• Recurring low coolant warning light or the need to add coolant repeatedly without an obvious external leak source

• A sweet coolant smell from the engine bay, especially after the engine reaches normal operating temperature

• Visible cracking, crazing, or discoloration on the plastic connector body at the coupling walls or hose ports

• Soft or collapsing hose connections at the connector ports, indicating a failed or distorted sealing surface

If any of these signs appear, replace the connector without delay. Additionally, pressure-test the cooling system after installation to confirm no adjacent junction is seeping before returning the vehicle to service.

7M3 122 291 Coolant Hose Connector — Key Features

• OEM Reference: 7M3 122 291 (Genuine Volkswagen/Audi OE — right-side upper and/or lower hose coupling)

• Factory-spec plastic/composite construction for heat and coolant resistance

• Precision hose port geometry for correct fit with factory hoses, O-rings, and clamps

• Right-side upper and/or lower radiator hose junction depending on application

• Supplied as a component within upper and lower hose assemblies — confirms OE dimensional accuracy

• OE specification: part cannot be reused or reinstalled after removal; always replace with a new unit

• Restores leak-free coolant routing and stable operating temperatures

• Direct-fit replacement — no modifications required

Service Notes for the 7M3 122 291 Coolant Hose Connector

• First, replace all related O-rings and hose clamps at the same time; reusing aged seals on a new connector commonly causes repeat leaks at the right-side hose junction

• Next, inspect adjacent coolant hoses for softness, swelling, or cracking; replacing brittle hoses together with the connector avoids a return cooling system visit

• Also, never reuse the removed connector — the OE specification explicitly states that this part cannot be reinstalled after removal; always fit a new unit

• Then, refill with the correct VW/Audi-approved coolant (G13 or G12++ per your owner’s manual) at the proper concentration; using the wrong coolant chemistry can degrade plastic fittings prematurely

• Finally, bleed the cooling system thoroughly after refilling; this purges air pockets that cause localized overheating and false temperature readings

7M3 122 291 Coolant Hose Connector — Compatibility & Applications

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

Note: Position is right-side upper and/or lower hose junction depending on application. This part is supplied as a component within hose assemblies on some vehicles. Always confirm the exact hose position and production date by VIN before ordering.

Cross Reference Numbers

• • 7M3 122 291 (Genuine VAG OE — current)

  • 3B0 122 291C (VAG OE — alternate/superseded)

  • Dorman 902-714

  • WG1805629 / 116142 / 771481