Four Seasons 2678N A/C Compressor Kit - Front

Four Seasons PAC-Kit w/ New Compressor 2678N

Four Seasons 2678N is an A/C compressor kit for classic GM trucks, SUVs, and select compact cars with R4 compressor applications. This PAC-Kit w/ New Compressor is built for buyers restoring or repairing factory air conditioning on Chevrolet C10, K10, GMC C1500, and related platforms from 1976-1984.

Key Features

• Four Seasons PAC-Kit w/ New Compressor for R4 compressor applications
• Fits a wide range of 1976-1984 Chevrolet and GMC vehicles, including C10, K10, C20, K20, C30, and K30 models
• Also covers select Buick, Oldsmobile, Pontiac, and Chevrolet passenger cars from 1978-1981
• Application notes include compressor switch, pulley, metric thread, and accumulator/drier configurations where required
• Part number 2678N for catalog and fitment lookup

Detailed Description

Four Seasons 2678N is a PAC-Kit w/ New Compressor for vehicles using an R4-style A/C compressor setup. Coverage includes many Chevrolet and GMC truck and van applications, plus select Buick Skylark, Chevrolet Citation, Oldsmobile Omega, Pontiac Phoenix, and Sunbird models. For shoppers searching for a replacement A/C compressor kit for a 1984 Chevrolet C10, 1984 GMC K1500, or 1978-1984 Chevrolet K5 Blazer, this kit matches the listed factory configurations and notes.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Fix

• Loss of cabin cooling from a worn or failed A/C compressor
• Noisy compressor operation in R4-equipped systems
• Compressor clutch or switch-related service needs on listed applications
• Air conditioning performance issues tied to aging factory components
• Fitment problems when replacing an original R4 compressor on classic GM platforms

Installation Notes

Verify the vehicle year, make, model, and compressor configuration before ordering. Match the listed notes for switch type, pulley diameter, metric threads, and front or N/A position coverage. For best results, follow standard A/C service procedures, including system flushing and correct oil handling, and confirm the orifice and accumulator/drier configuration shown in the fitment notes.

Quality Assurance

Four Seasons is a recognized HVAC parts brand with broad coverage for automotive air conditioning service. Part number 2678N is cataloged for the specific applications listed above, helping ensure the correct replacement selection for compatible Chevrolet, GMC, Buick, Oldsmobile, and Pontiac vehicles.