Four Seasons 6640R A/C Compressor Kit - Front and Rear

Four Seasons 6640R A/C Compressor Kit

Restore cabin cooling on classic GM trucks and vans with the Four Seasons 6640R PAC-Kit w/ Reman Compressor. This A/C compressor kit is built for 1978-1979 Chevrolet and GMC applications using an A6 compressor with a single-groove pulley and standard threads.

The Four Seasons PAC-Kit line combines the remanufactured compressor with the related A/C service components needed for a proper repair path on the listed vehicles. Part number 6640R is a direct-fit solution for front and rear HVAC applications on select Chevrolet C10 Suburban, K5 Blazer, GMC Jimmy, and related models.

Key Features

• Four Seasons PAC-Kit w/ reman compressor
• Part number 6640R for select 1978-1979 GM applications
• Configured for A6 compressor systems
• Single-groove pulley and standard-thread compressor setup
• Fits front and rear HVAC applications
• Includes application-specific A/C service components listed by the manufacturer

Detailed Description

Four Seasons 6640R is an A/C compressor kit for classic Chevrolet and GMC platforms that use the A6 compressor design. It is listed for 1978-1979 Chevrolet C10 Suburban, C20 Suburban, G10, G20, G30, K10 Suburban, K20 Suburban, and K5 Blazer, plus 1978-1979 GMC Jimmy and 1978-1979 GMC G15, G25, and G35 models. Additional 1979 GMC coverage includes C1500 Suburban, C2500 Suburban, G1500, G2500, G3500, K1500 Suburban, and K2500 Suburban.

This part cross-references 57087 for the same application.

Common Repair Uses

• Loss of A/C compressor output on an A6-equipped system
• Noise or rough operation from the compressor assembly
• Cooling performance problems in Chevrolet C10 Suburban and GMC Jimmy HVAC systems
• Service replacement for aging compressor hardware on classic GM trucks and vans
• Repair of front and rear air conditioning systems on listed vehicles

Installation Notes

Verify the vehicle uses an A6 compressor with a single-groove pulley and standard threads before ordering. Match the compressor configuration and HVAC layout to the vehicle listing, especially on 1978-1979 Chevrolet and GMC truck, van, and SUV applications. Follow standard A/C service procedures, including system flushing and correct oil handling, during installation.

Quality Assurance

Four Seasons supplies this PAC-Kit as a remanufactured compressor solution for the listed GM applications. Part number 6640R is cataloged for direct vehicle-specific use on the fitment shown above.