Coolant Hose Flange – 1K0 121 087E (OE)

Description

Product Description

The 1K0121087E Coolant Hose Flange (OE) is a genuine-spec replacement used on various Volkswagen and Audi models, particularly those built on the MK5/MK6 and 8P platforms. This molded coolant line is responsible for routing engine coolant between key components—such as the radiator, expansion tank, or engine block—ensuring that the cooling system maintains the correct pressure and flow for stable engine operating temperatures.

Over time, the original hose can deteriorate due to constant exposure to high temperatures, pressure, and engine vibration. The rubber can soften, swell, or develop internal cracks, while plastic connection points can become brittle and snap. These issues lead to coolant leaks, low-coolant warnings, and potential engine overheating. Replacing the worn line with this OE-quality 1K0121087E hose restores a factory-tight seal and reliable coolant circulation.

• OEM reference: 1K0 121 087E
• OE-quality molded construction for precise routing and clearance
• Engineered to withstand high cooling system pressures and extreme heat
• Designed to match factory bends and connection points for a direct-fit installation
• Helps prevent coolant loss and protects the engine from overheating
• Durable materials ensure a long service life compared to standard aftermarket hoses

Applications

Used on select Volkswagen and Audi models that specify coolant hose part number 1K0121087E. This is commonly found on various 2.0T and 2.5L engines.

(Please confirm compatibility via VIN or parts catalog to ensure this matches your specific cooling system configuration.)

Service Notes

• It is highly recommended to replace any associated hose clamps and O-rings during installation to ensure a long-lasting, leak-free seal.
• Refill the system with the correct VW/Audi-approved coolant (G12++/G13) and properly bleed the air from the cooling system after service.
• Inspect nearby plastic coolant flanges and connectors; replacing aging components together can prevent future leaks.

Additional information

No fitment data available.