Type 25 Water Hose - Thermostat Housing To Plastic Water Pipe T-Piece - 1986-92 - 2100cc

This replacement rubber coolant hose connects the thermostat housing to the main bleed circuit pipe on 2100cc petrol Waterboxer engines fitted to VW Type 25 buses from 1986 to 1992. It is the correct hose for non-Syncro (2WD) models only.

On the 2.1 Waterboxer cooling system, this hose plays a vital role in the bleed circuit, allowing trapped air to escape from the thermostat area and ensuring coolant circulates correctly. A sound hose here is essential for proper bleeding, stable operating temperatures, and preventing hot spots—particularly after coolant changes or system work.

Manufactured from high-quality NBR fabric-reinforced rubber, this hose is moulded to the exact original shape and specification, delivering a perfect fit, correct routing, and long service life. The reinforced construction resists heat, pressure, and vibration common in the Waterboxer engine bay.

Please note: Does not fit Syncro models.

What this hose does and how it works

Coolant flows from the thermostat housing through this hose into the bleed pipe, allowing air to be purged from the system during warm-up and bleeding procedures. By maintaining a clear, leak-free path, the hose helps the thermostat operate accurately and keeps engine temperatures consistent.

Fitment

• Vehicle: VW Type 25 / T3 (2WD only)

• Years: 1986–1992

• Engine: 2100cc petrol Waterboxer

• Application: Thermostat housing to main bleed pipe

Engine code compatibility

• DJ: 2.1 (04/84 – 07/92)

• MV: 2.1 (08/85 – 07/92)

• SR: 2.1 (08/86 – 07/92)

• SS: 2.1 (08/89 – 07/92)

Quality

• Good quality

• NBR fabric-reinforced rubber

• OE-correct moulded shape

Fitting requirements (sold separately)

• 18.5mm hose clip: N10098001

• 14mm hose clip: N10254901

Fitting notes

• Always replace hose clips to ensure even clamping

• Inspect the thermostat housing outlet and bleed pipe for corrosion

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

A critical cooling system hose that helps ensure easy bleeding, correct thermostat function, and reliable temperature control on 2.1 Waterboxer Type 25 buses.