T4,G3 VR6 Water Flange For Cooling System - 1995-00

This replacement thermostat pipe flange, also known as the thermostat pipe union, is fitted to all Volkswagen VR6 engines and is commonly found on T4 Transporters. It forms part of the engine cooling system and connects the thermostat housing to the associated coolant pipework.

The pipe flange bolts directly to the thermostat housing and provides a secure mounting point for the coolant hose or pipe, allowing coolant to flow correctly through the engine once the thermostat opens. As engine temperature rises, coolant is directed through this union and into the wider cooling circuit, helping regulate engine temperature and prevent overheating.

On VR6 engines, these flanges are subject to constant heat cycling and coolant exposure. Over time, the original component can warp, crack, or degrade around the sealing surface or hose connection, often leading to coolant leaks. Replacing the flange restores a proper seal and ensures reliable coolant flow.

This replacement thermostat pipe union is manufactured to the correct specification for VR6 engines and provides a direct, factory-style fit. It is ideal for cooling system repairs, thermostat replacement, or preventative maintenance on ageing vehicles.

Other parts that may be required or recommended when fitting:

• Thermostat housing seal or gasket

• Hose seals or O-rings (where applicable)

• Coolant hoses and hose clips

• Fresh coolant

Ensuring this flange is in good condition is essential for maintaining cooling system pressure, preventing leaks, and keeping your VR6 engine running at the correct operating temperature.

Applications

• VW T4 Transporter: 1996 – 2003 (VR6 engines)

• VW Golf Mk3: 1992 – 1998 (VR6 engines)

• VW Corrado: 1989 – 1995 (VR6 engines)