Gates 31522 Radiator Cap

Reliable Cooling System Protection for BMW and Mercedes-Benz

The Gates OE Type Radiator Cap 31522 is engineered to maintain optimal pressure in your vehicle's cooling system. Designed for select BMW, Chrysler, Dodge, Jeep, and Mercedes-Benz models, this standard radiator cap ensures consistent coolant flow and system integrity under varying operating conditions.

• Standard cap design with a 20 psi pressure rating
• Cap depth of 1.25 inches for secure sealing
• Filler neck inside diameter of 1.61 inches (41 mm) and outside diameter of 2.13 inches (54 mm)
• Compatible with optional coolant recovery systems
• Shell diameter measures 2.33 inches for precise fitment

About the Gates OE Type Radiator Cap Line

The OE Type Radiator Cap product line by Gates focuses on delivering original equipment performance and fitment. The 31522 radiator cap meets OE specifications, providing reliable pressure control and sealing for your vehicle’s cooling system. This ensures compatibility and durability across a range of applications, including luxury and performance vehicles.

Product Details and Specifications

This radiator cap features a pressure rating of 20 psi, which falls within the SAE pressure range of 18-22 psi, helping to maintain the correct pressure balance in the cooling system. The cap depth of 1.25 inches and filler neck dimensions (inside diameter 1.61 inches, outside diameter 2.13 inches) are designed to fit securely on compatible filler necks. The optional coolant recovery system compatibility allows for integration with vehicles equipped with recovery tanks, enhancing system efficiency.

Compatible Vehicles and Applications

• BMW models including 190E, 260E, 300 series (300CE, 300D, 300E, 300SD, 300SDL, 300SE, 300SEL, 300SL, 300TD, 300TE), 350SD, 350SDL, 380SE, 380SEC, 380SEL, 380SL, 400E, 400SE, 400SEL, 420SEL, 500E, 500SEC, 500SEL, 500SL, 524td, 560SEC, 560SEL, 560SL, 600SEC, 600SEL, 600SL, M3, M5, M6, S65 AMG, SL65 AMG, SL320, SL500, SL600, SLK230
• Chrysler, Dodge, Jeep models including Aspen, Challenger, Charger, Dakota, Durango, Grand Cherokee, Viper
• Mercedes-Benz models including C36 AMG, C220, C230, C280, CL65 AMG, CL600, E300, E320, E420, E500, S320, S350, S420, S500, S600, S600L

Common Cooling System Issues Addressed

• Prevents coolant loss due to improper sealing
• Maintains correct system pressure to avoid overheating
• Supports coolant recovery system operation
• Reduces risk of radiator or hose damage from pressure fluctuations
• Ensures consistent coolant flow and engine temperature regulation

Installation Notes and Tips

Ensure the radiator filler neck is clean and free of debris before installing the Gates OE Type Radiator Cap 31522. Align the cap properly and tighten until secure to maintain the 20 psi pressure rating. This cap is designed for vehicles with compatible filler neck dimensions and optional coolant recovery systems. Regular inspection of the cap and cooling system is recommended to maintain optimal performance.

Quality Assurance and Warranty

Gates OE Type Radiator Caps are manufactured to meet original equipment standards, ensuring reliable performance and durability. The 31522 part number is backed by Gates’ quality control processes, providing confidence in fitment and function. Please refer to Gates’ official warranty policy for specific coverage details.