Four Seasons 1277NK A/C Compressor and Component Kit

Complete A/C Kit for Ford FS10 Applications

Four Seasons 1277NK is a complete A/C compressor kit for select Ford trucks with FS10 compressor systems and factory air. It includes the new compressor, accumulator, orifice tube, oil, and O-rings to support a full air conditioning service on covered Ford F-250, F-250 HD, and F-350 applications.

The Four Seasons Complete A/C Kit line is built for repair jobs that call for matched HVAC components in one package. This kit is configured for R134a refrigerant systems and uses a red standard orifice tube with a .062 in. opening.

Key Features

• Four Seasons part number 1277NK
• Complete air conditioning kit with new compressor
• Includes compressor oil and O-rings
• Uses an orifice tube expansion device
• R134a refrigerant type
• Accumulator dimensions: 3.500 in. diameter, 9.500 in. length
• Accumulator inlet: 0.625 in. male insert O-ring
• Accumulator outlet: 0.750 in. male insert O-ring
• Limited lifetime warranty

Detailed Description

Four Seasons 1277NK is a direct-fit HVAC service kit for Ford trucks equipped with an FS10 compressor and factory air. It is listed for 1994 Ford F-250 and F-350, 1995-1996 Ford F-250, 1995-1997 Ford F-350, and 1997 Ford F-250 HD applications. The kit includes a new compressor, accumulator, red standard orifice tube, compressor oil, and O-rings, giving you the core components needed for a complete A/C compressor replacement on these Ford F-250 and Ford F-350 platforms.

This part cross-references 520069 and MK1073 for the same application.

What This Kit Helps Address

• Loss of cooling performance from a worn compressor
• Contaminated or degraded A/C oil during compressor service
• Restricted refrigerant flow through a worn orifice tube
• Moisture control concerns tied to accumulator replacement
• Seal leakage at serviced A/C connections

Installation Notes and Tips

Verify FS10 compressor fitment, factory air equipment, and red orifice tube configuration before installation. Confirm the vehicle uses R134a refrigerant and match the accumulator inlet and outlet connection sizes to the original system. Replace the included O-rings during assembly and follow proper evacuation, leak testing, and recharge procedures after service.

Quality Assurance

Four Seasons 1277NK is backed by a limited lifetime warranty. The kit is built as a complete A/C compressor replacement solution for select Ford truck applications, including Ford F-250, Ford F-250 HD, and Ford F-350 models listed above.