Gates 31566 Radiator Cap

Reliable Cooling System Protection for GM Vehicles

The Gates OE Type Radiator Cap 31566 is engineered to maintain optimal pressure in your vehicle's cooling system. Designed specifically for select Buick, Cadillac, Chevrolet, GMC, Pontiac, and Saturn models, this threaded radiator cap ensures a secure seal and consistent performance under varying operating conditions.

• Threaded radiator cap design for secure fitment
• Pressure rating of 18 psi (SAE range 16-20 psi) to maintain proper coolant system pressure
• Cap depth and filler neck depth of 1.25 inches (32 mm) for precise compatibility
• Filler neck inside diameter approximately 1.15 inches (29 mm) and outside diameter 1.81 inches (46 mm)
• Compatible with closed coolant recovery systems
• Shell diameter of 2.56 inches for standard radiator neck sizes

About the Gates OE Type Radiator Cap Product Line

The OE Type Radiator Cap line from Gates is designed to meet original equipment specifications, providing reliable sealing and pressure control for cooling systems. This product line focuses on delivering consistent OE performance, ensuring that replacement radiator caps like part number 31566 maintain the integrity of the cooling system in vehicles such as the Chevrolet Camaro, Cadillac DTS, and GMC Sierra 2500 HD.

Product Details and Specifications

The Gates 31566 radiator cap features a threaded design that fits securely onto the radiator filler neck, preventing coolant leaks and maintaining system pressure at 18 psi. The cap depth and filler neck depth of 1.25 inches (32 mm) ensure proper engagement, while the filler neck diameters (inside 1.15 inches/29 mm, outside 1.81 inches/46 mm) match OEM dimensions for a precise fit. This cap is intended for use with closed coolant recovery systems, common in many GM vehicles including the Pontiac G8 and Saturn Aura. The shell diameter of 2.56 inches accommodates standard radiator openings, making it suitable for a range of models.

Applications and Common Issues Addressed

• Prevents coolant leaks caused by worn or damaged radiator caps
• Maintains proper cooling system pressure to avoid overheating
• Ensures efficient coolant recovery in closed systems
• Replaces faulty caps that cause coolant loss or engine temperature fluctuations
• Restores OEM-level sealing performance for improved system reliability

Installation Notes and Tips

When installing the Gates OE Type Radiator Cap 31566, ensure the radiator filler neck is clean and free of debris. Align the threaded cap carefully and tighten until secure, avoiding over-tightening which can damage the threads. This cap is designed for closed coolant recovery systems, so verify system compatibility before installation. Regular inspection of the radiator cap and cooling system is recommended to maintain optimal vehicle performance.

Quality Assurance and Warranty

Gates OE Type Radiator Caps are manufactured to meet or exceed original equipment standards, providing dependable performance and durability. Part number 31566 undergoes rigorous quality control to ensure consistent pressure ratings and fitment accuracy. While specific warranty details may vary, Gates products typically come with a limited warranty covering defects in materials and workmanship.