Stant 10259 Engine Coolant Reservoir Cap

OE Type Reservoir Cap for Closed Cooling Systems

The Stant 10259 engine coolant reservoir cap is a 20 psi threaded cap for closed cooling systems. Built from durable plastic, it helps maintain the pressure needed for stable coolant operation in the reservoir on supported applications.

Stant’s OE Type Reservoir Cap line focuses on direct-fit replacement coverage for vehicles that use a threaded filler neck and a 20 psi pressure rating. This Stant 10259 cap is a practical choice for drivers servicing Saab 9-3, Saab 9-5, Saturn L-series, and select Chevrolet, Pontiac, and Suzuki models.

• 20 psi pressure rating for closed cooling systems
• Threaded filler neck design
• Durable plastic construction
• OE Type Reservoir Cap from Stant
• Fits a wide range of Saab, Saturn, Chevrolet, Pontiac, and Suzuki applications

Fitment Details

• Fits 2004-2011 Chevrolet Aveo, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2006-2011 Chevrolet Aveo5, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2009-2010 Pontiac G3, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2009 Pontiac G3 Wave, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2005-2008 Pontiac Wave, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2005-2007 Pontiac Wave5, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2004-2006 Suzuki Verona, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 1999-2005 Saab 9-5, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2001-2005 Saturn L300, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2004 Suzuki Swift+, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 1999-2003 Saab 9-3, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2001-2003 Saturn L200, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2001-2003 Saturn LW200, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2001-2003 Saturn LW300, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2001-2002 Saturn L100, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2002 Saturn Vue, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2000 Saturn LS, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2000 Saturn LS1, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2000 Saturn LS2, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2000 Saturn LW1, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2000 Saturn LW2, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 1994-1998 Saab 900, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap

What This Cap Helps Address

• Coolant loss from a worn or weak reservoir cap
• Pressure control issues in a closed cooling system
• Reservoir sealing problems at the threaded filler neck
• Cooling system service needs on Saab 9-3, Saab 9-5, and Saturn L300 applications
• Replacement needs for Chevrolet Aveo, Pontiac G3, and Suzuki Verona models

Installation Notes and Tips

Verify the reservoir uses a threaded filler neck and a 20 psi cap specification before installation. Inspect the sealing surface and neck threads for damage, then install the cap securely by hand to ensure proper engagement. For best results, confirm the vehicle application against the listed fitment for your exact year and model, including Saab 9-3, Saab 9-5, and Saturn L-series vehicles.

Quality Assurance

Stant is known for OE-style cooling system service parts, and the 10259 follows that approach with application-specific fitment and a 20 psi pressure rating. This part cross-references AC Delco (e.g., RC98, RC100) for the same application.