Dorman 926-390 4WD Vacuum Check Valve

Reliable 4WD Vacuum Check Valve for Ford and Lincoln Vehicles

The Dorman 926-390 4WD vacuum check valve is designed to maintain proper vacuum flow in the driveline system of select Ford and Lincoln models. Engineered with durable EPDM material and precise dimensions, this valve ensures consistent performance for your 4x4 vacuum system.

• Compatible with Ford Expedition, Ford F-150, and Lincoln Navigator
• Constructed from durable black EPDM material for long-lasting use
• Measures 8 inches in length with a maximum diameter of 10 mm (0.39 in)
• Features a round connector shape for secure hose attachment
• Includes three ports with outside diameters of 3 mm and 5 mm for versatile vacuum fitting sizes
• Package contains one 4WD vacuum check valve

Product Details and Specifications

The Dorman 926-390 vacuum check valve is specifically designed for driveline and axle vacuum systems in 4WD vehicles. Its black EPDM construction offers resistance to heat, oil, and wear, making it suitable for under-hood applications. The valve’s 8-inch length and 0.39-inch outer diameter provide a precise fit, while the round connector shape ensures a secure connection to vacuum hoses. With three ports sized at 3 mm and 5 mm, this valve accommodates various vacuum fitting sizes, enhancing compatibility and ease of installation.

Applications and Problem Resolution

• Prevents vacuum leaks in the 4WD vacuum system
• Maintains proper vacuum pressure for 4x4 engagement
• Eliminates driveline vacuum check valve failure symptoms such as 4WD system malfunction
• Replaces worn or damaged vacuum check valves in Ford Expedition, F-150, and Lincoln Navigator
• Supports consistent 4WD system operation under varying driving conditions

Installation Notes and Tips

Ensure the vacuum hoses are clean and free of debris before installation. Verify the correct orientation of the check valve to maintain unidirectional vacuum flow. The round connector shape facilitates a tight seal; however, inspect hose clamps for secure attachment. This valve is designed to fit specific vacuum hose sizes (3 mm and 5 mm ports), so confirm hose compatibility prior to installation.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards, providing reliable performance and durability. The 926-390 vacuum check valve undergoes rigorous quality control to ensure proper fit and function. Please refer to Dorman’s warranty policy for specific coverage details.