T4 Transporter Water Hose Connector (AAB,AAF,ACU)

This plastic coolant hose connector is a genuine Volkswagen part used to join two coolant hoses together within the cooling system on pre-1996 VW T4 Transporters. It is specifically fitted to 5-cylinder petrol and diesel engines equipped with air conditioning, where correct coolant flow and hose routing are essential for stable engine temperature control.

What this part does

The connector links two coolant hoses, allowing coolant to flow smoothly between sections of the cooling system. On T4 models with air conditioning, the cooling circuit layout requires additional hose connections, making this small component vital for maintaining proper circulation and preventing leaks.

A damaged or brittle connector can lead to coolant loss, overheating, or air entering the system—issues that can quickly escalate into more serious engine problems.

How it works

Installed inline between two rubber coolant hoses, the connector provides a rigid joining point while the hoses are secured with clamps. Its moulded plastic design ensures the correct internal diameter for unrestricted coolant flow and a tight seal at each hose end.

Key features

• Genuine Volkswagen part

• Designed to join two coolant hoses

• Correct internal diameter for factory cooling systems

• Ideal replacement for aged, cracked, or leaking originals

• Essential for maintaining proper coolant circulation

Engine compatibility

• Pre-1996 5-cylinder engines

  • Petrol

  • Diesel

• With air conditioning fitted

Vehicle applications

• VW T4 Transporter: 1990–1996

Fitting notes

• Always inspect surrounding hoses for hardening or cracks

• Replace hose clips if corroded or weakened

• Cooling system should be checked and bled after installation

Although small, this genuine hose connector plays a crucial role in keeping your T4 Transporter’s cooling system sealed and functioning correctly—helping to protect your engine from overheating and coolant loss.