025-121-058J VW Vanagon Coolant Hose - 1.9L & 2.1L Wasserboxer

Coolant Hose – 025-121-058J

The 025-121-058J is a high-quality coolant hose specifically designed for the Volkswagen Vanagon equipped with the 1.9L or 2.1L Wasserboxer engine. This hose is a vital component of the complex water-cooling system, responsible for transporting coolant between the thermostat housing and the water pump or cylinder head areas. In the rear-engine Vanagon, the cooling system operates under high pressure and relies on a constant flow to prevent the engine from overheating, especially during long climbs or hot summer drives.

Constructed from heat-resistant, reinforced EPDM rubber, the 025-121-058J is built to withstand the extreme temperature fluctuations of the engine bay. Over time, original coolant hoses can become soft, brittle, or "balloon" under pressure, which leads to sudden leaks and potential engine failure. Replacing these aging hoses with new, factory-spec versions is the best way to ensure the long-term reliability of your Vanagon’s cooling system.

Detailed Vehicle Compatibility

Fits 1.9L & 2.1L Wasserboxer engines only.

VW Vanagon:

• 1986, 1987, 1988, 1989, 1990, 1991

Product Highlights & Features

• Reinforced EPDM Rubber: Engineered with internal braiding to handle high coolant pressures without expanding or bursting.

• Precision Molded: Features the correct factory bends and inner diameter to ensure a perfect, leak-free fit onto the engine's coolant flanges.

• Chemical Resistant: Designed to resist degradation from modern antifreeze additives and engine oils.

• Direct OEM Replacement: Matches the exact specifications of the original Volkswagen part for a straightforward installation.

Technical Specifications

• Part Number: 025-121-058J

• Material: Reinforced EPDM Rubber

• Engine Type:

  • 1.9L (DG & SP Engine Codes)

  • 2.1L (DJ, SR, MV & SS Engine Codes)

• Application: Cooling System Feed/Return

Installation & Maintenance Tips

• Use New Clamps: When replacing this hose, it is highly recommended to use new stainless steel hose clamps. Avoid over-tightening, as this can cut into the rubber and cause premature failure.

• Inspect the Flanges: Before installing the new hose, check the plastic or metal coolant flanges for corrosion, pitting, or cracks. A rough flange surface is a common cause of leaks even with a brand-new hose.

• Bleed the System: Because the Vanagon cooling system is prone to trapping air, you must follow the proper bleeding procedure at the radiator and the engine bleeder valve after refilling the coolant.

• Coolant Choice: Always use the correct phosphate-free coolant (like G11 or G12+, depending on your specific setup) to prevent internal corrosion of the engine’s aluminum components.

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