Gates 31335 Radiator Cap

Reliable Cooling System Protection for Audi, Porsche, and Volkswagen

The Gates OE Type Radiator Cap 31335 is designed to maintain optimal pressure in your vehicle's cooling system. Engineered as a threaded coolant bottle cap, it ensures a secure seal for closed coolant recovery systems in select Audi, Porsche, and Volkswagen models.

• Threaded coolant bottle cap design for secure fitment
• Pressure rating of 20 psi (SAE range 18-22 psi) to maintain system integrity
• Cap depth of 0.88 inches (22 mm) for precise sealing
• Filler neck inside diameter of 1.31 inches (33 mm) and outside diameter of 2.16 inches (55 mm)
• Shell diameter of 2.27 inches for compatibility with specified filler necks
• Compatible with closed coolant recovery systems
• OE performance rating ensuring reliable operation

About the Gates OE Type Radiator Cap Line

The OE Type Radiator Cap line from Gates is engineered to meet original equipment specifications, providing consistent pressure control and sealing performance. This product line focuses on delivering precise fit and function for vehicles requiring threaded coolant bottle caps, such as many Audi, Porsche, and Volkswagen models. The 31335 part number represents a cap designed to maintain the correct pressure and prevent coolant loss in closed recovery systems.

Product Details and Specifications

The Gates 31335 radiator cap features a threaded design with a cap depth of 0.88 inches (22 mm), ensuring a tight seal on the coolant bottle filler neck. The filler neck dimensions include an inside diameter of 1.31 inches (33 mm) and an outside diameter of 2.16 inches (55 mm), with a shell diameter of 2.27 inches. This cap is rated for 20 psi pressure, within the SAE pressure range of 18-22 psi, making it suitable for maintaining proper coolant system pressure and preventing overheating or coolant loss. It is specifically designed for closed coolant recovery systems, commonly found in Audi, Porsche, and Volkswagen vehicles.

Compatible Vehicles and Applications

• Compatible with Audi models including 80, 80 Quattro, 90, 90 Quattro, 100, 100 Quattro, 200, 200 Quattro, A4, A4 Quattro, A6, A6 Quattro, A8, A8 Quattro, S4, S6, S8, and V8 Quattro
• Fits Porsche models such as 924, Boxster, Cabriolet, Corsar, Coupe, Coupe Quattro, and 4000, 4000 Quattro
• Suitable for Volkswagen models including Atlantic, Fox, Golf, Jetta, Quantum, Quattro, Rabbit Convertible, and Rabbit Pickup

Common Cooling System Issues Addressed

• Prevents coolant leakage due to improper sealing
• Maintains correct system pressure to avoid overheating
• Supports closed coolant recovery system operation
• Reduces risk of radiator cap failure under pressure
• Helps maintain coolant system efficiency and longevity

Installation Notes and Tips

Ensure the radiator cap threads match the filler neck dimensions before installation. Clean the filler neck area to remove debris or old coolant residue. Screw the cap on firmly until it seats properly to maintain the 20 psi pressure rating. Regular inspection of the cap and cooling system is recommended to detect wear or damage early.

Quality Assurance and Warranty

The Gates OE Type Radiator Cap 31335 is manufactured to meet original equipment standards, ensuring reliable performance and durability. It carries an OE comparison rating, confirming its suitability as a replacement part. Please refer to Gates' official warranty policy for specific coverage details.