Four Seasons 2678R A/C Compressor Kit

Four Seasons PAC-Kit w/ Reman Compressor 2678R

Four Seasons 2678R is an A/C compressor kit for older GM and GM-based applications that use an R4 compressor. This PAC-Kit w/ Reman Compressor supports direct replacement service for Chevrolet C10, K10, C20, K20, C30, K30, and related GMC and passenger-car fitments across the 1976-1984 model years.

Key Features

• Four Seasons PAC-Kit w/ Reman Compressor for HVAC A/C compressor replacement
• Remanufactured compressor application for R4-equipped systems
• Fitment coverage for Chevrolet C10, K10, C20, K20, C30, K30 and GMC C1500, C2500, C3500, K1500, K2500, K3500 applications
• Also listed for select Buick, Oldsmobile, Pontiac, and Chevrolet passenger vehicles
• Part number 2678R for catalog and service matching

Detailed Description

Four Seasons 2678R is built for classic truck and car A/C service where the original system uses an R4 compressor. The fitment data includes 1976-1984 Chevrolet and GMC trucks, plus select 1979-1981 Buick, Chevrolet, Oldsmobile, and Pontiac models. Common search terms for this part include reman A/C compressor kit for 1984 Chevrolet C10, 1980-1983 GMC K1500 A/C compressor replacement, and 1978-1979 Chevrolet K20 compressor kit. The part number 2678R is also useful when matching service records or ordering by reference.

What It Helps Address

• Loss of cabin cooling performance
• Noisy or worn R4 compressor operation
• Compressor seizure or internal wear
• System service needs on older Chevrolet and GMC A/C systems
• Replacement needs for select Buick, Oldsmobile, and Pontiac R4 applications

Installation Notes and Tips

Verify the vehicle’s compressor style and system details before ordering. Fitment notes vary by application and may include compressor switch, J tube tank drier, metric threads, single-groove pulley, or 4-5/8 inch and 5 inch pulley configurations. Follow standard A/C service procedures, including system evacuation, flushing where required, and correct oil handling for the replacement compressor.

Quality Assurance

Four Seasons is a recognized aftermarket HVAC brand, and this remanufactured compressor kit is cataloged for specific OE-style applications. This part cross-references other service listings for the same application, including 57231 and 33204.