Gates 31546 Radiator Cap

OE Type Radiator Cap for Closed Systems

The Gates 31546 OE Type Radiator Cap is built for closed coolant recovery systems that require accurate pressure control and a threaded coolant bottle cap design. It is a direct-fit cooling system service part for select Chevrolet, Pontiac, Saab, Saturn, Suzuki, and Land Rover applications, including Chevrolet Aveo and Saab 9-3 models.

• OE Type radiator cap for closed coolant recovery systems
• 20 psi pressure rating with an 18-22 psi SAE pressure range
• Threaded coolant bottle cap design
• Corrosion-resistant construction for long service life
• Meets or exceeds OEM specifications in function, form, and fit
• Gates part number 31546

Gates OE Type Product Line

Gates OE Type cooling system components are built to match original equipment requirements for fit and pressure control. This radiator cap is engineered for applications that use a closed system and a 58 mm filler neck inside diameter, helping maintain the correct cooling system pressure in vehicles such as the Chevrolet Aveo, Pontiac G3, and Saab 9-5.

This part cross-references Four Seasons (e.g., 46077) and Monroe Shocks & Struts (e.g., 33076) for the same application.

Key Features

• Pressure rating: 20 psi
• SAE pressure range: 18-22 psi
• Filler neck inside diameter: 2.28 in / 58 mm
• Filler neck outside diameter: 2.4 in / 61 mm
• Filler neck depth: 0.73 in / 19 mm
• Shell diameter: 3.29 in
• OE performance rating

Vehicle Fitment

• Fits 2017-2018 Chevrolet Aveo, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2004-2014 Chevrolet Aveo, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2006-2011 Chevrolet Aveo5, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2007-2010 Pontiac G3, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2004-2010 Pontiac Matiz, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2005-2008 Pontiac Wave, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2005-2007 Pontiac Wave5, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2004-2006 Suzuki Verona, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 1999-2005 Saab 9-5, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2001-2005 Saturn L300, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2004 Suzuki Swift+, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 1999-2003 Saab 9-3, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2001-2003 Saturn L200, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2001-2003 Saturn LW200, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2001-2003 Saturn LW300, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2001-2002 Saturn L100, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2002 Saturn Vue, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2000 Saturn LS, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2000 Saturn LS1, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2000 Saturn LS2, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2000 Saturn LW1, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 2000 Saturn LW2, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 1996-1998 Land Rover Discovery, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 1994-1998 Saab 900, N/A; 20 psi Pressure Rating; OE Type Radiator Cap
• Fits 1995 Land Rover Range Rover, N/A; W/O Sensor; 20 psi Pressure Rating; OE Type Radiator Cap

Common Issues This Part Addresses

• Loss of cooling system pressure from a worn or weak cap
• Coolant overflow or recovery system pressure imbalance
• Improper sealing at the filler neck
• Pressure-related overheating concerns in closed systems
• Fitment issues when replacing an OE-style threaded coolant bottle cap

Installation Notes and Tips

Verify the filler neck dimensions before installation: 2.28 in (58 mm) inside diameter, 2.4 in (61 mm) outside diameter, and 0.73 in (19 mm) depth. Confirm the vehicle uses a closed coolant recovery system and a 20 psi cap specification before replacement. Inspect the sealing surface and neck condition for damage, corrosion, or debris so the cap can seat correctly.

Quality Assurance

Gates manufactures this radiator pressure cap to meet or exceed OEM specifications for function, form, and fit. The corrosion-resistant construction is selected to support long service life and accurate pressure control in the specified cooling system applications.