025-121-082 VW Vanagon Coolant Bleed Valve - 1.9L Manual (1983-1985)

Coolant Bleed Valve – 025-121-082

The 025-121-082 is a specialized Coolant Bleed Valve designed specifically for the early water-cooled Volkswagen Vanagon equipped with the 1.9L Wasserboxer engine and a manual transmission. This component is a vital part of the cooling system's plumbing, acting as a high-point air release junction in the engine bay. Because the Vanagons cooling system is complex due to its rear-engine and front-radiator configuration, this valve is essential for purging trapped air pockets that can cause erratic temperature readings or localized overheating.

Constructed from durable, heat-resistant composite material, the 025-121-082 is built to withstand the high pressures of the Vanagon cooling circuit. Over decades of service, these original plastic valves often become brittle or the internal sealing surfaces fail, leading to slow coolant leaks. Replacing a compromised valve ensures you can properly maintain the cooling system and protect your cylinder heads from the damage caused by air-bound cooling circuits.

Detailed Vehicle Compatibility

Fits 1.9L Wasserboxer engines with manual transmission from chassis F 24-D-089 699.

VW Vanagon (1.9L):

• 1983, 1984, 1985

Engine Fitment Codes:

• DF: 1.9L

• DG: 1.9L

• DH: 1.9L

• GW: 1.9L

• SP: 1.9L

Product Highlights & Features

• Essential Air Purge Point: Provides a designated exit point for air trapped in the engine-side of the cooling system, ensuring full coolant circulation.

• Model Specific Fitment: Engineered specifically for the manual transmission 1.9L plumbing layout for a direct, hassle-free installation.

• High-Temp Construction: Made from glass-reinforced composite material to resist the thermal stress and pressure of the Wasserboxer engine bay.

• Prevents Air-Lock: A functional bleed valve is the key to preventing "air-lock" scenarios that lead to warped cylinder heads and blown seals.

Technical Specifications

• Part Number: 025-121-082

• Component Type: Coolant Bleed Valve / Junction

• Engine Type: 1.9L Wasserboxer

• Transmission Compatibility: Manual Transmission Only

• Chassis Range: From F 24-D-089 699 and newer

Installation & Maintenance Tips

• Operating the Valve: When bleeding the system, open the screw carefully. Use caution as the escaping air and coolant will be hot.

• Hand Tighten Only: Be careful not to over-torque the bleed screw. The plastic threads can strip if forced, which would require the replacement of the entire valve body.

• Elevation for Success: For the most effective air removal, ensure the front of the van is slightly elevated when filling and bleeding the system to push air toward the high-point valves.

• Seal Inspection: If you notice white or pink crust around the valve, it is a sign of a slow leak. Inspect the valve body for hairline cracks, which are common as the plastic ages and becomes brittle.

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