Gates 31566 Radiator Cap

OE Type Radiator Cap for Closed Cooling Systems

The Gates 31566 OE Type Radiator Cap is built for closed cooling systems that require an 18 psi pressure rating. It is a threaded radiator cap engineered to match OEM specifications in function, form, and fit for dependable cooling system pressure control.

Compatible With select Chevrolet Camaro, Impala, Corvette, Silverado HD, and GMC Sierra HD applications, this Gates radiator cap is also used across Buick, Cadillac, Pontiac, Saturn, and GMC platforms listed below. The 31566 part number is a direct OE-style replacement for vehicles that call for a 1.25 in filler neck depth and a 2.56 in shell diameter.

Key Features

• Gates OE Type Radiator Cap, part number 31566
• Threaded radiator cap design for closed coolant recovery systems
• 18 psi pressure rating with SAE pressure range of 16-20 psi
• Corrosion-resistant metal or high-quality plastic construction, depending on application
• OE Performance rating for factory-style fit and pressure control
• Filler neck inside diameter: 1.15 in (29 mm)
• Filler neck outside diameter: 1.81 in (46 mm)
• Filler neck depth: 1.25 in (32 mm)

Product Details

Gates designs the OE Type Radiator Cap line to meet or exceed OEM specifications in function, form, and fit. This cap helps maintain the correct pressure in the cooling system, which is important for stable coolant operation in vehicles such as the Chevrolet Camaro, Chevrolet Impala, and Cadillac DTS. The 31566 radiator cap is specified for closed systems and is built to provide accurate pressure control with long service life.

This part cross-references Anchor 10269 and Carlson 7061 for the same application.

What It Helps Address

• Cooling system pressure loss
• Coolant overflow or improper recovery in a closed system
• Pressure cap wear from corrosion or age
• Incorrect cap fit on the radiator filler neck
• Factory-style replacement needs for OE-type cooling service

Installation Notes and Tips

• Verify the filler neck dimensions before installation: 1.15 in inside diameter, 1.81 in outside diameter, and 1.25 in depth.
• Use only on applications specified for an 18 psi threaded radiator cap.
• Inspect the radiator neck and sealing surfaces for damage before installing the cap.
• Confirm the vehicle uses a closed coolant recovery system.

Quality Assurance

Gates manufactures this radiator cap to meet or exceed OEM specifications and environmental regulatory standards. The construction is selected for corrosion resistance and consistent pressure control, supporting reliable cooling system service on the listed applications.

Vehicle Fitment

• Fits 2010-2015 Chevrolet Camaro, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2006-2011 Buick Lucerne, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2006-2011 Cadillac DTS, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2011 Chevrolet Caprice, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2006-2011 Chevrolet Impala, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2011 Chevrolet Silverado 2500 HD, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2011 Chevrolet Silverado 3500 HD, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2011 GMC Sierra 2500 HD, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2011 GMC Sierra 3500 HD, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2005-2010 Chevrolet Corvette, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2008-2009 Buick LaCrosse, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2004-2009 Cadillac XLR, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2009 Pontiac G8, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2009 Pontiac Montana, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2006 Pontiac Montana, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2006-2008 Chevrolet Uplander, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2006-2007 Buick Terraza, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2006-2007 Chevrolet Monte Carlo, N/A; 18 psi Pressure Rating; OE Type Radiator Cap
• Fits 2007 Saturn Relay, N/A; 18 psi Pressure Rating; OE Type Radiator Cap