Calorstat RC0003 Engine Coolant Reservoir Cap

Engine Coolant Reservoir Cap for Volkswagen Vanagon

The Calorstat RC0003 is a threaded engine coolant reservoir cap built with plastic and rubber for pressurized cooling systems. It is specified for a 16 PSI opening pressure and is listed for 1983-1985 Volkswagen Vanagon applications, with Vernet noted as an OE supplier to Volkswagen.

Key Features

• Engine coolant reservoir cap with threaded attachment
• Pressurized design with 16 PSI opening pressure
• Plastic and rubber construction for cooling system sealing
• Standard cap type for reservoir applications
• No pressure release lever
• Cross-reference part number: RC236

Product Details

Calorstat RC0003 is a replacement coolant reservoir cap for pressurized cooling systems that require a 16 PSI rating. The threaded design helps secure the cap to the reservoir, while the plastic and rubber construction supports sealing at the specified pressure. This part is listed for 1983-1985 Volkswagen Vanagon models and is identified under part number RC0003 for catalog and service matching.

This part cross-references 100 121 0062 for the same application.

Common Issues It May Address

• Coolant loss from a cap that no longer seals properly
• Pressure-related cooling system warnings from a weak reservoir cap
• Steam or overflow caused by incorrect cap pressure retention
• Difficulty maintaining stable coolant system pressure
• Replacement needs on a 1983-1985 Volkswagen Vanagon cooling system

Installation Notes and Tips

Verify reservoir neck style, thread engagement, and pressure specification before installation. Match the cap to the vehicle’s cooling system requirements and inspect the reservoir sealing surface for wear, cracks, or contamination. For fitment reference, this cap fits 1983-1985 Volkswagen Vanagon, N/A.

Quality Assurance

Calorstat lists Vernet as an OE supplier to Volkswagen, supporting application-specific replacement selection for the Volkswagen Vanagon cooling system. Confirm part number RC0003 against the original cap and vehicle service information before installation.