The 5N0 122 291 is an OE-style upper radiator coolant hose adapter by Burgaflex, engineered for the VW Tiguan Mk1 (5N-chassis) equipped with the 2.0L EA113/EA888 engine. Positioned at the front upper radiator hose junction, this coupling piece — supplied with its C-clip and seal — provides a secure, leak-free connection between the upper coolant hose and the radiator inlet. It serves as a cost-effective alternative to the Genuine VW part while maintaining OE-style fit and performance. Always confirm fitment by VIN before ordering.
$10.00
The 5N0 122 291 Coolant Hose Adapter by Burgaflex is an OE-style upper radiator coupling piece. Specifically, it is designed for the Volkswagen Tiguan Mk1 (5N-chassis) with the 2.0L four-cylinder engine. This fitting connects the upper coolant hose to the radiator inlet port, maintaining a sealed, leak-free junction in the primary cooling circuit. Furthermore, it ships complete with its C-clip retention spring and sealing ring, so the entire coupling assembly replaces in a single step. Because the 5N-chassis Tiguan runs a unique PQ46-based cooling layout, this adapter fits only the Mk1 Tiguan (2009–2018). As a result, it does not interchange with Mk2 MQB-platform variants.
Over time, the plastic body of the 5N0 122 291 coolant hose adapter weakens from repeated heat cycling and sustained system pressure. In particular, the quick-release coupling port at the radiator inlet experiences the most frequent thermal expansion and contraction cycles. Consequently, hairline cracks can form at this location. Additionally, the C-clip and sealing ring can harden and lose their retention force. Even a minor failure at this junction allows coolant to bypass the coupling. As a result, gradual coolant loss, recurring low-coolant warnings, and progressive engine overheating can follow. Therefore, replacing the failing coupling promptly with a new 5N0 122 291 restores a factory-correct sealed junction.
Catching a failing 5N0 122 291 early prevents escalating cooling system damage. Therefore, watch for these warning signs:
Coolant seeping or leaving dried residue around the upper radiator hose coupling or at the radiator inlet port
Recurring low coolant warnings despite topping off the reservoir, with no other obvious leak source
A sweet coolant odor from the engine bay after reaching normal operating temperature
Visible cracking or brittleness on the plastic coupling body or at the C-clip retention groove
The upper radiator hose feeling loose or failing to click and lock securely into place
If any of these symptoms appear, replace the 5N0 122 291 promptly. Additionally, pressure-test the cooling system before returning the vehicle to service.
OEM Reference: 5N0 122 291 (Burgaflex OE-style aftermarket)
Upper radiator coolant hose adapter — front position
Supplied complete with C-clip retention spring and sealing ring
Engineered to match OE connector geometry for the VW Tiguan Mk1 (5N-chassis)
Compatible with the 2.0L EA113/EA888 engine (1984cc)
Cost-effective OE-style alternative to the Genuine VW dealer component
Direct-fit replacement — no modifications required
Always verify fitment by VIN before ordering. Multiple variants may exist within the same model year.
5N0 122 291 (VAG OEM reference — Burgaflex OE-style replacement)
CHC0729 (Rein Automotive cross-reference)
| Weight | 0.25 lbs |
|---|---|
| Dimensions | 6.0 × 4.0 × 3.0 in |
| Year | Make | Model | Engine | Notes |
|---|---|---|---|---|
| 2009-2017 | Volkswagen | Tiguan | 2.0L |
The 8W0 122 293A is a Genuine Audi OE upper coolant hose coupling for the Audi A4 (B9), A4 allroad, A5, and A5 Sportback equipped with the 2.0L 45 TFSI petrol engine (2017–2020). Positioned at the water pump housing, this flange connects the upper radiator coolant hose and includes a C-clip and seal in the box. Because this coupling is a single-use component, always install a new unit whenever the upper coolant hose is disturbed — no modifications required.
The 5Q0 122 291DA is the OE 3-port coolant hose connector located at the water pump on select Volkswagen and Audi MQB-platform vehicles. It serves as the central junction point between the coolant hoses routing to the radiator, heater circuit, and engine — covering a wide range of 1.8T and 2.0T turbocharged applications from Golf and GTI to Audi A3, TT, and Q3. This part is superseded by 5Q0 122 291AL, which is the current OE replacement. Always confirm fitment by VIN before ordering.
The 5N0 122 291C is an OE-style lower radiator coolant hose adapter by VIKA, engineered for the VW Tiguan Mk1 (5N-chassis) with the 2.0L four-cylinder engine. Positioned at the front lower radiator hose junction, this coupling piece connects the lower coolant hose to the radiator outlet port, completing the primary cooling circuit return path. It serves as a cost-effective alternative to the Genuine VW lower adapter. Always confirm fitment by VIN before ordering.
The Graf VW Water Pump 026 121 005H is an OE-quality belt-driven replacement for select Volkswagen and Audi 4-cylinder engines. Built for direct installation with no modifications required.
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