Four Seasons 3806NK A/C Compressor and Component Kit

Complete A/C Kit for GM Truck Applications

Four Seasons 3806NK is a Complete A/C Kit built for select Chevrolet and GMC full-size truck applications with an HT6 compressor. It combines the major air conditioning service components needed for a compressor replacement, including the new compressor, accumulator, orifice tube, oil, and O-rings.

For 1999-2002 Chevrolet C1500 and Silverado 1500, plus 2001-2002 GMC Sierra 1500 and related HD/3500 applications, this kit supports R134a systems that use an orifice tube expansion device and PAG oil /150.

Key Features

• Four Seasons Complete A/C Kit, part number 3806NK
• Includes a new compressor, accumulator, orifice tube, oil, and O-rings
• Uses PAG Oil /150 and is specified for R134a refrigerant systems
• Orifice tube style is standard with a black tube and 0.072 in. diameter
• Receiver drier/accumulator uses P-nut inlet and outlet fittings
• Limited lifetime warranty
• This part cross-references Raybestos Brakes MK1026 for the same application.

Product Details

The Four Seasons Complete A/C Kit line is built for service jobs where the compressor and related refrigerant-control components are replaced together. Part number 3806NK includes the compressor, accumulator, orifice tube, oil, and sealing components to support a complete repair on compatible Chevrolet Silverado 1500, Chevrolet C1500, and GMC Sierra 1500 platforms, along with select Sierra 2500 HD, Sierra 3500, Silverado 2500 HD, and Silverado 3500 applications listed in the fitment data. The kit is configured for HT6 compressor systems and uses an orifice tube expansion device rather than a thermal expansion valve.

What It Helps Address

• Loss of cooling performance from a worn or failed compressor
• Restricted refrigerant flow caused by a clogged or incorrect orifice tube
• Moisture or contamination concerns in the accumulator and refrigerant circuit
• Oil loss or incorrect oil service during A/C compressor replacement
• Seal leakage at service connections and refrigerant joints

Installation Notes and Tips

• Verify HT6 compressor fitment and match the vehicle’s listed year, make, and model before installation.
• Confirm the system uses an orifice tube setup and the specified 13 mm / 0.072 in. tube diameter where noted.
• Replace the accumulator and O-rings during compressor service to help restore system integrity.
• Flush the system as needed to remove debris before installing the new compressor.
• Use the correct R134a service procedures and charge specifications for the vehicle.

Quality Assurance

Four Seasons 3806NK is backed by a limited lifetime warranty. It is a complete air conditioning kit with new compressor construction and application-specific components for select Chevrolet and GMC truck platforms.