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

This replacement rubber coolant hose connects the radiator circuit to the oil cooler, effectively running from the oil cooler to the water pump on 1900cc and 2100cc petrol Waterboxer engines fitted to VW Type 25 buses from 1985 onwards. It is a vital part of the cooling system, ensuring correct coolant flow through the water-cooled oil cooler before returning to the engine.

On Waterboxer engines, the oil cooler relies on a steady supply of coolant from the main cooling circuit to regulate engine oil temperature. This hose carries coolant between the oil cooler and the water pump/radiator circuit, helping maintain stable oil and engine temperatures. Failure of this hose can result in rapid coolant loss and overheating, making replacement critical if the original shows any signs of ageing.

Manufactured from high-quality NBR fabric-reinforced rubber, this hose is moulded to the exact original shape and specification, ensuring perfect alignment, correct clearance, and a long service life even under constant heat and pressure.

What this hose does and how it works

Coolant returning from the radiator flows through the oil cooler via this hose, absorbing heat from the engine oil before being recirculated by the water pump. A sound hose here ensures efficient oil cooling, consistent coolant circulation, and overall engine reliability.

Fitment

• Vehicle: VW Type 25 / T3

• Years: 1985 onwards

• Engines: 1900cc & 2100cc petrol Waterboxer

• Application: Radiator circuit to oil cooler / oil cooler to water pump

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

• NBR fabric-reinforced rubber

• OE-correct moulded profile

• Designed for long service life

Fitting requirements (sold separately)

• 18.5mm hose clip: N10098001

• 23mm hose clip: N0164021

Fitting notes

• Always renew hose clips to ensure even clamping

• Inspect oil cooler stubs and water pump connections for corrosion

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

A critical cooling hose that helps keep oil temperatures controlled, coolant circulating correctly, and your Waterboxer engine protected.