Four Seasons 26779 A/C System Valve Core and Cap Kit

Four Seasons AC System Seal Kit 26779

Restore service access and sealing performance in your vehicle’s air conditioning system with the Four Seasons AC System Seal Kit 26779. This cap and valve A/C system seal kit is built for R12 and R134a refrigerant applications and uses aluminum construction with black plastic caps for a direct-service replacement on many domestic and import platforms.

Four Seasons AC System Seal Kit 26779 is a practical choice for A/C service work on Ford F-150, Ford Expedition, Lincoln Navigator, and other listed applications. It is designed as a cap and valve core kit for A/C service ports where sealing integrity and refrigerant compatibility matter.

Key Features

• Cap and valve A/C system seal kit for HVAC service ports
• Refrigerant type support: R12 and R134a
• Aluminum body construction with black plastic caps
• Specific cap inside diameter for application matching
• Valve core material listed as specific for service-fit accuracy
• Four Seasons part number 26779 for catalog lookup and ordering

Product Details

This Four Seasons AC System Seal Kit is intended for vehicles that use cap-and-valve style A/C service fittings. The aluminum construction helps provide a durable service-point interface, while the plastic black caps help protect the ports after service. With coverage across a wide range of Ford, Lincoln, Dodge, Jeep, Chrysler, Cadillac, Land Rover, Ram, Chevrolet, Mazda, Mercury, Pontiac, Buick, Oldsmobile, and Lexus applications, it supports common HVAC repair and maintenance needs on many 1994-2017 vehicles. If you are sourcing Four Seasons 26779 for a Ford F-150 A/C service repair or a Lincoln Navigator HVAC seal replacement, verify the listed fitment before installation.

This part cross-references Global Parts Distributors LLC 1311569 for the same application.

What It Helps Address

• Damaged or missing A/C service port caps
• Worn valve cores that can affect refrigerant retention
• Leaking service connections during HVAC maintenance
• Contaminant intrusion at exposed A/C ports
• Service-point wear on older or high-mileage vehicles

Installation Notes and Tips

• Confirm the vehicle’s refrigerant type and service-port style before installation.
• Inspect the existing port threads and sealing surfaces for damage before replacing the cap and valve core components.
• Use proper A/C service procedures when opening or servicing the system.
• Match the application to the listed fitment for Ford, Lincoln, Dodge, Jeep, Chrysler, Cadillac, and other supported models.
• For search accuracy, this kit is commonly referenced as Four Seasons 26779 AC system seal kit.

Quality Assurance

Four Seasons supplies HVAC service components for automotive air conditioning repair, and this seal kit is cataloged for direct application matching across the listed vehicles. Review the fitment data carefully to confirm compatibility with your specific year, make, and model before service.