Gates 31405 Radiator Cap

OE Type Radiator Cap for Closed Cooling Systems

The Gates 31405 OE Type Radiator Cap is built for closed coolant bottle applications that require accurate pressure control and a threaded cap design. With a 15 psi pressure rating and OE performance comparison, it is a direct-fit cooling system service part for select Pontiac, Saturn, Chevrolet, Buick, Cadillac, and Oldsmobile vehicles.

For drivers searching for a radiator cap for 2004 Pontiac GTO, 1997-2000 Chevrolet Corvette, or 1995-2002 Saturn SC1/SC2, this Gates radiator cap is built to match the original function, form, and fit expected in OE-style cooling system service.

Key Features

• Gates OE Type Radiator Cap, part number 31405
• Threaded coolant bottle cap for closed system applications
• 15 psi pressure rating with SAE pressure range of 14-18 psi
• OE performance comparison rating for factory-style service
• Corrosion-resistant construction for long service life
• Filler neck inside diameter: 1.31 in. (33 mm)
• Filler neck outside diameter: 1.99 in. (51 mm)
• Filler neck depth: .75 in. (19 mm)
• Shell diameter: 3.3 in.

Product Details

Gates designs the 31405 radiator cap to meet or exceed OEM specifications in function, form, and fit. The cap is constructed from corrosion-resistant metal or high-quality plastic, depending on application, to help maintain consistent pressure control in the cooling system. This matters in vehicles such as the Chevrolet Corvette, Saturn SL2, and Pontiac Grand Am, where stable system pressure supports proper coolant management.

This part cross-references Four Seasons 46047 and Febi-Bilstein 33046 for the same application.

Common Cooling System Issues It Can Address

• Loss of coolant pressure from a worn or weak cap
• Coolant overflow or recovery issues in a closed system
• Improper sealing at the filler neck
• Pressure-related cooling system instability
• Service replacement for a damaged or corroded radiator cap

Installation Notes and Tips

• Verify the filler neck dimensions before installation: 1.31 in. inside diameter, 1.99 in. outside diameter, and .75 in. depth.
• Confirm the vehicle uses a closed coolant recovery system and a threaded coolant bottle cap.
• Inspect the filler neck sealing surface for corrosion, cracks, or debris before installing the new cap.
• Use the specified 15 psi rating when replacing the original cap on the listed applications.
• For fitment verification, match the vehicle application to the listed year, make, and model before service.

Quality Assurance

Gates manufactures this radiator cap to meet or exceed OEM specifications and environmental regulatory standards. The 31405 is built for accurate pressure control and consistent OE-style performance in the cooling system.

• Fits 2004 Pontiac GTO, N/A
• Fits 1995-2002 Saturn SC1, N/A
• Fits 1995-2002 Saturn SC2, N/A
• Fits 1995-2002 Saturn SL, N/A
• Fits 1995-2002 Saturn SL1, N/A
• Fits 1995-2002 Saturn SL2, N/A
• Fits 1995-2001 Saturn SW2, N/A
• Fits 2000 Cadillac Seville, N/A
• Fits 1997-2000 Chevrolet Corvette, N/A
• Fits 1995-1999 Oldsmobile Aurora, N/A
• Fits 1999 Oldsmobile Intrigue, N/A
• Fits 1995-1999 Saturn SW1, N/A
• Fits 1992-1998 Buick Skylark, N/A
• Fits 1995-1998 Chevrolet Cavalier, N/A
• Fits 1997-1998 Chevrolet Malibu, N/A
• Fits 1992-1998 Oldsmobile Achieva, N/A
• Fits 1997-1998 Oldsmobile Cutlass, N/A
• Fits 1992-1998 Pontiac Grand Am, N/A
• Fits 1995-1998 Pontiac Sunfire, N/A
• Fits 1994-1996 Buick Roadmaster, N/A
• Fits 1994-1996 Cadillac Commercial Chassis, N/A
• Fits 1994-1996 Cadillac Fleetwood, N/A
• Fits 1994-1996 Chevrolet Caprice, N/A
• Fits 1992-1996 Chevrolet Corsica, N/A
• Fits 1994-1996 Chevrolet Impala, N/A
• Fits 1994 Chevrolet Commercial Chassis, N/A