G3 Metal Water Pipe - 1.9 Diesel

This metal engine coolant pipe is the main coolant distribution pipe used on Volkswagen 1.9 diesel engines. It runs along the engine block and acts as the central feed point for multiple coolant hoses, distributing coolant from the pump to the cylinder head, oil cooler, heater circuit, and associated cooling components.

Unlike plastic alternatives, this metal pipe offers improved durability and resistance to heat cycling, corrosion, and hose clamp damage. Over time, original pipes can corrode internally or leak at hose connections, leading to coolant loss and overheating. Replacing the pipe restores proper coolant flow and provides a solid foundation for renewing surrounding hoses.

Manufactured to the correct shape and diameter for direct replacement, this pipe is ideal during cooling system overhauls, engine refreshes, or when chasing persistent coolant leaks on 1.9 diesel platforms.

Engine code compatibility

1Z (1.9 TDI), AEY (1.9 SDI), AHU (1.9 TDI), ALE (1.9 TDI), AKW (1.7 SDI)

Vehicle fitment summary

VW Golf Mk3

• 1993–1999

• 1.9 Diesel / TDI

• Hatchback & Estate

• Power outputs: 64, 90 PS

• Engine codes: 1Z, AEY, AHU, ALE

VW Golf Mk3 Cabriolet

• 1994–2002

• 1.9 Diesel / TDI

• Engine codes: 1Z, AHU

VW Vento

• 1993–1998

• 1.9 Diesel / TDI

• Saloon

• Power outputs: 64, 90 PS

VW Polo Classic (6V2)

• 1995–2001

• 1.9 / 1.7 Diesel

• Saloon

• Power outputs: 57, 64, 90 PS

• Engine codes: AEY, AKW

VW Caddy Mk2 (Caddy II)

• 1995–2004

• 1.9 / 1.7 Diesel

• MPV

• Power outputs: 57, 64, 90 PS

VW Passat (B3 / B4)

• 1993–1997

• 1.9 Diesel / TDI

• Saloon & Estate

• Power output: 90 PS

Recommended related parts

• Coolant hoses connected to distribution pipe

• Hose clips and seals

• Thermostat and housing seal

• Correct VW coolant (G11 / G12 as specified)