Gates 31328 Radiator Cap

OE Type Radiator Cap for Volkswagen Cooling Systems

The Gates 31328 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 Volkswagen EuroVan, Cabrio, Golf, Jetta, Passat, and Corrado applications.

Gates OE Type Radiator Cap 31328 is engineered to meet or exceed OEM specifications in function, form, and fit. With a 20 psi pressure rating and OE performance comparison rating, it supports proper system pressure management in Volkswagen cooling systems that use a threaded coolant bottle cap.

Key Features

• Part number: 31328
• OE Type Radiator Cap for closed coolant recovery systems
• Threaded coolant bottle cap design
• 20 psi pressure rating with SAE pressure range of 18-22 psi
• Filler neck inside diameter: 1.98 in / 50 mm
• Filler neck outside diameter: 2.28 in / 58 mm
• Filler neck depth: 0.74 in / 19 mm
• Shell diameter: 3.11 in
• Corrosion-resistant construction for long service life
• Meets or exceeds OEM specifications in function, form, and fit

Product Details

The Gates OE Type Radiator Cap line is built for dependable pressure control in cooling systems where cap sealing and pressure regulation are critical. This Gates 31328 radiator cap uses corrosion-resistant materials and is manufactured to meet environmental regulatory standards that help reduce air pollution. It is a practical replacement for Volkswagen cooling system service, including 1990-1999 Volkswagen Golf, 1990-1999 Volkswagen Jetta, 1990-1997 Volkswagen Passat, 1990-1994 Volkswagen Corrado, 1995-2002 Volkswagen Cabrio, and 1993-2003 Volkswagen EuroVan applications.

This part cross-references Dorman - HELP 46051 and Wix 33050 for the same application.

Common Uses

• Restoring proper coolant system pressure after a worn or leaking cap
• Addressing coolant loss caused by a weak cap seal
• Correcting pressure-related overheating concerns in the cooling system
• Replacing a damaged threaded coolant bottle cap
• Maintaining stable operation in a closed coolant recovery system

Installation Notes

Verify filler neck dimensions, pressure rating, and closed-system design before installation. This Gates 31328 cap is specified for threaded coolant bottle cap applications with a 20 psi rating, so matching the original cap style and system requirements is important for proper sealing and pressure control. Confirm vehicle coverage for your Volkswagen EuroVan, Cabrio, Golf, Jetta, Passat, or Corrado before ordering.

Quality Assurance

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