The 1J0 121 087A coolant hose flange by URO Parts is an OE-style direct-fit replacement for select Volkswagen and Audi vehicles, manufactured to ISO 9000 standards.
$3.61
The 1J0 121 087A coolant hose flange by URO Parts is an OE-style replacement fitting used on select Volkswagen and Audi models equipped with 1.6 and 2.0 petrol engines. Located along the upper radiator hose, this multi-way junction serves as a critical connection point in the engine cooling circuit, branching coolant flow between the radiator, expansion tank, and engine block. It also features an outlet for the coolant temperature sensor, making it specific to models with air conditioning. Correct function of this flange is essential for maintaining stable engine operating temperatures and reliable heater performance.
The original plastic housing is subjected to constant heat cycling, cooling system pressure, and vibration. Over time, the material becomes brittle, leading to hairline cracks or complete failure at the hose barbs — causing sudden coolant loss, low-coolant warnings, and overheating risk. Replacing the failed unit with the URO 1J0 121 087A restores a secure, leak-free junction and dependable cooling system operation.
A cracking or leaking coolant hose flange produces clear, recognizable symptoms. The most common warning signs include visible coolant seeping or dripping at the upper radiator hose junction, a persistent coolant smell from the engine bay after driving, and unexplained drops in coolant reservoir level. In more advanced cases, a cracked housing may cause a sudden loss of coolant and rapid engine overheating. Physical inspection may reveal a visibly cracked, whitish-residue-coated, or brittle plastic housing. Prompt replacement prevents coolant loss and the risk of serious engine damage.
OEM Reference: 1J0 121 087A
Brand: URO Parts — ISO 9000 manufacturing standards
Multi-way design with integrated temperature sensor outlet — for A/C-equipped models
OE-style construction engineered for correct fit and proper hose alignment
Durable, heat-resistant composite construction designed to withstand cooling system pressure
Precision-molded barbs for a secure, leak-free interface with all attached coolant hoses
Use new hose clamps during installation to ensure a long-lasting, leak-free seal. Inspect all connected hoses for swelling, softness, or internal cracking and replace any aged hoses at the same time to prevent future failures. Verify the coolant temperature sensor is properly seated and sealed before refilling. After installation, refill with the VW/Audi-approved coolant mixture and properly bleed the cooling system to remove trapped air before returning the vehicle to service.
Always verify fitment by VIN before ordering.
| Make | Model | Generation | Year Range | Engine |
|---|---|---|---|---|
| Volkswagen | Golf | Mk4 | 1998–2004 | 1.6 (AEH, AKL) |
| Volkswagen | Golf | Mk4 | 1998–2004 | 2.0 (AQY, APK) |
| Volkswagen | Golf | Mk4 | 2003–2006 | 1.9 TDI |
| Volkswagen | Jetta / Bora | Mk4 | 2001–2004 | 1.6 / 2.0 / 2.8 |
| Audi | TT / TT Quattro | Mk1 (8N) | 2001–2002 | 1.8T |
| Audi | A3 | 8L | 1997–2003 | 1.6 (AEH, AKL) |
1J0 121 087A
VAICO V10-0299
URO-008053
147-0048
902-913
| Weight | 0.25 lbs |
|---|---|
| Dimensions | 5.0 × 4.0 × 3.0 in |
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