026-121-144A VW & Audi Engine Coolant Flange - Golf, Jetta, 4000

Engine Coolant Hose Flange – 026-121-144A

The 026-121-144A is a vital cooling system connector used across a vast range of water-cooled Volkswagen and Audi models. Typically located on the cylinder head, this flange serves as a junction point for heater hoses and radiator bypass lines. These flanges are made of high-temperature composite material, which can become brittle and crack after years of thermal cycling, leading to "mystery" coolant loss and potential engine overheating.

Replacing a worn flange with a high-quality unit ensures a reliable, leak-free seal and maintains the structural integrity of your cooling or heating circuit. It is a primary maintenance item for the inline-four engines found in the Golf, Jetta, and various Audi platforms.

Detailed Vehicle Compatibility

Audi 4000:

• 1984, 1985, 1986, 1987

Audi 80:

• 1988, 1989, 1990

Audi 90:

• 1988

VW Cabriolet:

• 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993

VW Corrado:

• 1990, 1991, 1992

VW Fox:

• 1987, 1988, 1989, 1990, 1991, 1992, 1993

VW Golf:

• 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1997, 1998

VW Jetta:

• 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1997, 1998, 1999

VW Quantum:

• 1984, 1985

VW Rabbit Convertible:

• 1984

VW Scirocco:

• 1983, 1984, 1985, 1986, 1987, 1988

Product Highlights & Features

• Durable Construction: Made from high-grade composite materials designed to withstand the extreme temperatures and pressures of the cooling system.

• Direct OEM Replacement: Manufactured to the exact dimensions of part 026-121-144A, ensuring that hose angles and mounting points align perfectly with the cylinder head.

• Leak Prevention: Designed to replace warped or cracked factory plastic housings that are prone to failure after long-term heat exposure.

Technical Specifications

• Part Number: 026-121-144A

• Interchange Part: 037-121-145

• Material: Reinforced Plastic / Composite

Installation & Maintenance Tips

• Always Replace the Gasket: Never reuse an old O-ring when installing a new flange. A fresh seal is required to prevent leaks between the plastic flange and the engine surface.

• Avoid Overtightening: Overtightening the mounting bolts can crack the plastic housing immediately. Use a torque wrench to meet factory specifications (typically around 10 Nm).

• Surface Preparation: Ensure the mounting surface on the engine is completely clean and free of old gasket material or corrosion before installation.

• Inspect Hoses: This is the ideal time to inspect your radiator and heater hoses for soft spots or bulging, as they must be removed during this repair.

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026-121-144E

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