Gates 31529 Radiator Cap

OE Type Radiator Cap for Closed Cooling Systems

The Gates 31529 OE Type Radiator Cap is built for closed coolant bottle systems that require accurate pressure control and a threaded coolant bottle cap design. With a 22 psi pressure rating and OE performance comparison, it serves as a direct-fit cooling system service part for select Audi, Volkswagen, Porsche, and Lamborghini applications.

Gates OE Type Radiator Cap 31529 is engineered to meet or exceed OEM specifications for function, form, and fit. It uses corrosion-resistant construction and is made to maintain consistent pressure control in the cooling system, helping support stable operating temperatures in vehicles such as the Audi A6, Volkswagen Passat, and Porsche Cayenne.

Key Features

• OE Type Radiator Cap for closed coolant recovery systems
• Threaded coolant bottle cap design
• 22 psi pressure rating with 18-22 psi SAE pressure range
• OE performance comparison rating
• Corrosion-resistant construction for long service life
• Filler neck inside diameter: 2.18 in. / 55 mm
• Filler neck outside diameter: 2.47 in. / 63 mm
• Filler neck depth: 0.66 in. / 17 mm
• Shell diameter: 3.14 in.

Detailed Description

This Gates radiator cap is specified for closed-system cooling setups that use a threaded coolant bottle cap. The 22 psi pressure rating is important for maintaining the correct system pressure, which supports proper coolant expansion and recovery. Gates manufactures this cap to meet or exceed OEM specifications, making it a practical replacement for vehicles that call for OE-style pressure control and exact fitment. Part number 31529 is commonly referenced for Audi A3, A4, A6, TT, Q5, and Volkswagen Jetta, Golf, Tiguan, and Passat applications.

This part cross-references Four Seasons 33056 and Wix 46057 for the same application.

What It Helps Address

• Loss of coolant system pressure from a worn or weak cap
• Coolant overflow or improper recovery in a closed system
• Pressure-related cooling performance issues
• Fitment problems caused by incorrect filler neck dimensions
• Replacement needs for OE-style radiator cap service on Audi, Volkswagen, Porsche, and Lamborghini models

Installation Notes and Tips

• Verify filler neck inside diameter, outside diameter, and depth before installation.
• Confirm the vehicle uses a closed coolant recovery system with a threaded coolant bottle cap.
• Match the pressure rating to the original specification for the application.
• Inspect the sealing surface and neck condition before installing the new cap.
• Use the vehicle’s service information to confirm fitment for the exact model year and engine package.

Quality Assurance

Gates builds this OE Type Radiator Cap with corrosion-resistant materials and manufactures it to meet or exceed OEM specifications in function, form, and fit. The design is intended to provide accurate pressure control and dependable service in the cooling system. Part number 31529 is an OE-performance replacement for select Audi, Volkswagen, Porsche, and Lamborghini vehicles.