Calorstat RC0034 Engine Coolant Reservoir Cap

Engine Coolant Reservoir Cap for Volkswagen Applications

The Calorstat RC0034 is a threaded engine coolant reservoir cap built with plastic and rubber for pressurized cooling systems. It is specified at a 22.0 pressure rating and is a direct-fit style cap for select Volkswagen models, including EuroVan, Cabrio, Golf, Jetta, Passat, and Corrado.

Key Features

• Engine coolant reservoir cap with threaded attachment type
• Pressurized design with 22.0 maximum pressure rating
• Plastic and rubber construction for cooling system sealing
• Standard cap type for OE-style reservoir applications
• Fits select Volkswagen EuroVan, Cabrio, Golf, Jetta, Passat, and Corrado applications
• Part number RC0034 for catalog and cross-reference lookup

Detailed Description

Calorstat RC0034 is an engine coolant reservoir cap made for pressurized cooling systems that require a threaded, standard-style closure. The plastic and rubber construction is used to maintain a secure seal at the reservoir while supporting the specified 22.0 pressure rating. This cap is listed for Volkswagen fitments across 1995-2003 model years, including 1999-2003 Volkswagen EuroVan, 1995-2002 Volkswagen Cabrio, 1995-1999 Volkswagen Golf, 1995-1999 Volkswagen Jetta, 1995-1997 Volkswagen Passat, and 1995 Volkswagen Corrado. This part cross-references Gates 31328 for the same application.

Common Issues This Part May Address

• Coolant loss from a cap that no longer seals properly
• Pressure retention problems in the expansion tank
• Visible cracking, hardening, or wear in the cap seal
• Cooling system warning lights caused by a faulty reservoir cap
• Steam or odor from coolant escaping at the reservoir neck

Installation Notes and Tips

Verify the reservoir neck style, thread engagement, and pressure specification before installation. Compare the original cap to RC0034 to confirm the correct fit for your Volkswagen cooling system. Install on a cool engine and inspect the reservoir, seal surface, and surrounding hoses for damage or contamination that could affect sealing. Fits 1999-2003 Volkswagen EuroVan, N/A. Fits 1995-1997 Volkswagen EuroVan, N/A. Fits 1995-2002 Volkswagen Cabrio, N/A. Fits 1995-1999 Volkswagen Golf, N/A. Fits 1995-1999 Volkswagen Jetta, N/A. Fits 1995-1997 Volkswagen Passat, N/A. Fits 1995 Volkswagen Corrado, N/A.

Quality Assurance

Calorstat is listed as an OE supplier to Volkswagen, and RC0034 is cataloged for direct application matching on the specified vehicles. Part number RC0034 is identified for use in Volkswagen cooling system service where the original cap specification calls for a pressurized threaded reservoir cap.