Calorstat RC0002 Engine Coolant Reservoir Cap

Engine Coolant Reservoir Cap for Audi Applications

Calorstat RC0002 is a threaded engine coolant reservoir cap built from plastic and rubber for pressurized cooling systems. It is rated to open at 20 PSI, helping maintain the correct pressure in the coolant reservoir on select Audi models.

Key Features

• Engine coolant reservoir cap with threaded attachment
• Pressurized design with 20 PSI opening pressure
• Constructed from plastic and rubber
• Standard cap type for cooling system service
• No pressure release lever
• Cross-reference: URO 8E0121321

Detailed Description

This Calorstat coolant reservoir cap, part number RC0002, is specified for Audi cooling system applications that require a 20 PSI pressurized cap. It helps maintain reservoir pressure so the cooling system can operate at the intended pressure level. Vernet is an OE supplier to Audi, and this cap is listed across multiple Audi A6, A6 Quattro, A4, A4 Quattro, S4, A8 Quattro, S6, and S8 applications. If you are replacing a worn or damaged Audi coolant reservoir cap, RC0002 provides a direct-fit service part for the listed vehicles.

Vehicle Fitment

• Fits 2006-2011 Audi A6, N/A
• Fits 2002-2004 Audi A6, N/A
• Fits 2000-2011 Audi A6 Quattro, N/A
• Fits 2007-2011 Audi S6, N/A
• Fits 2003-2010 Audi A8 Quattro, N/A
• Fits 2007-2009 Audi S8, N/A
• Fits 2002-2006 Audi A4, N/A
• Fits 2002-2006 Audi A4 Quattro, N/A
• Fits 2004-2006 Audi S4, N/A
• Fits 2000-2002 Audi S4, N/A

Common Issues This Part Can Address

• Coolant reservoir cap that no longer holds pressure
• Visible cracking or deterioration in the cap body or seal
• Cooling system pressure loss from a worn cap seal
• Incorrect reservoir cap fitment on listed Audi models
• Service replacement for a damaged threaded coolant cap

Installation Notes and Tips

Verify the reservoir neck style and pressure rating before installation. This cap uses a threaded attachment and is intended for pressurized coolant reservoirs with a 20 PSI opening specification. Inspect the sealing surfaces for debris or damage before tightening the cap into place.

Quality Assurance

Calorstat RC0002 is built to OE-style specifications for the listed Audi cooling system applications. Vernet’s OE supplier relationship with Audi supports the application coverage and fitment accuracy for this part.