Gates 31332 Radiator Cap

OE Type Radiator Cap for BMW and Mini

The Gates 31332 OE Type Radiator Cap is built for closed coolant recovery systems that require accurate pressure control. With a 30 psi pressure rating and OE performance comparison, it serves BMW and Mini applications that depend on a threaded coolant bottle cap with the correct seal and fit.

Key Features

• OE Type Radiator Cap for closed coolant recovery systems
• 30 psi pressure rating with SAE pressure range of 28-30 psi
• Threaded coolant bottle cap design
• Corrosion-resistant construction for long service life
• Meets or exceeds OEM specifications in function, form, and fit
• Shell diameter: 2.61 in; cap depth: .98 in
• Filler neck dimensions: 1.16 in inside diameter, 2.14 in outside diameter, 1.62 in depth

Product Details

Gates 31332 is an OE-style radiator cap engineered for vehicles that use a closed coolant recovery system and a threaded coolant bottle cap. The cap is designed to maintain proper system pressure, which helps support stable cooling-system operation in BMW 230i, BMW 550i, BMW X5, Mini Cooper, and other listed applications. Gates builds this cap with corrosion-resistant metal or high-quality plastic depending on application, and the design is manufactured to meet or exceed OEM specifications for function, form, and fit. This part cross-references Febi-Bilstein 31332 and Four Seasons 33054 for the same application.

What This Part Helps Address

• Loss of coolant-system pressure
• Improper sealing at the coolant bottle neck
• Pressure-related overheating concerns
• Coolant overflow or recovery issues in a closed system
• Fitment problems caused by an incorrect cap depth or neck diameter

Installation Notes and Tips

Verify the filler neck inside diameter, outside diameter, and depth before installation. This cap is specified for closed coolant recovery systems and threaded coolant bottle applications, so confirm the pressure rating and neck dimensions match the original part. For fitment reference, it fits 2020 BMW 230i, 2013-2020 Mini Cooper, 2014-2016 BMW 550i, 2000-2006 BMW X5, and 1996-2002 BMW Z3 among the listed applications.

Quality Assurance

Gates manufactures this radiator cap to meet or exceed OEM specifications and environmental regulatory standards. The OE Type Radiator Cap line focuses on accurate pressure control and durable construction for direct replacement use in supported BMW and Mini cooling systems.