Type 25 Water Hose - Water Pump To Metal Pipe Which Goes To The Oil Cooler

This replacement rubber coolant hose is fitted between the water pump outlet and the oil cooler feed pipe on VW Type 25 / T3 buses from 1984 onwards, covering 1900cc and 2100cc petrol Waterboxer engines. It is a vital hose within the cooling system, ensuring reliable coolant flow from the water pump directly to the oil cooler circuit.

On Waterboxer engines, the oil cooler is water-cooled and depends on constant coolant circulation to regulate engine oil temperature. This hose carries coolant from the water pump outlet to the oil cooler feed pipe, allowing excess heat to be removed from the engine oil before coolant continues through the system. Any deterioration in this hose can quickly lead to coolant loss and rising oil temperatures, making replacement essential during servicing or restoration.

Manufactured from high-quality NBR fabric-reinforced rubber, this hose is precision-formed to the exact OE shape and specification, guaranteeing correct routing, secure sealing, and long service life. The reinforced construction provides excellent resistance to heat, pressure, vibration, and coolant chemicals, even in demanding engine bay conditions.

What this hose does and how it works

Coolant exits the water pump and flows through this hose to the oil cooler feed pipe. As coolant passes through the oil cooler, it absorbs heat from the engine oil, helping stabilise oil temperature and protect internal engine components. A sound hose here is essential for consistent cooling performance and long-term engine reliability.

Fitment

• Vehicle: VW Type 25 / T3

• Years: 1984–1992

• Engines: 1900cc & 2100cc petrol Waterboxer

• Application: Water pump outlet to oil cooler feed pipe

Engine code compatibility

• DG: 1.9 (02/85 – 07/86)

• SP: 1.9 (08/86 – 07/88)

• DJ: 2.1 (01/86 – 07/92)

• MV: 2.1 (08/85 – 07/92)

• SR: 2.1 (08/86 – 07/92)

• SS: 2.1 (08/89 – 05/92)

Quality

• Good quality

• NBR fabric-reinforced rubber

• OE-correct moulded profile

Fitting requirements (sold separately)

• 2 × 18.5mm hose clips: N10098001

Fitting notes

• Always renew hose clips to ensure even clamping

• Inspect water pump outlet and oil cooler feed pipe for corrosion

• Refill with the correct coolant and bleed the cooling system thoroughly after installation

A high-quality replacement hose that plays a crucial role in oil temperature control, coolant circulation, and overall Waterboxer engine reliability.