Four Seasons 4057R A/C Compressor Kit - Front

Four Seasons 4057R PAC-Kit A/C Compressor Kit

Four Seasons 4057R is a PAC-Kit with a remanufactured A/C compressor for classic GM applications that use an A6 compressor setup. It is built for direct replacement service on select Chevrolet Camaro, Bel Air, Caprice, El Camino, and Impala models, as well as GMC G-Series vans with rear A/C or A6 compressor configurations.

The Four Seasons PAC-Kit line combines the compressor service part with the related A/C service components called out for the application, making it a focused choice for restoring cabin cooling performance on older vehicles. Part number 4057R is listed for 1968-1972 fitments across the vehicles below.

• Remanufactured A/C compressor kit for select GM vintage HVAC systems
• Application-specific fitment for A6 compressor setups
• Listed for Chevrolet Camaro, Bel Air, Caprice, El Camino, and Impala
• Listed for GMC G15/G1500, G25/G2500, and G35/G3500 vans
• Fits vehicles with dealer air, rear A/C, expansion valve, or 6-inch pulley configurations as noted
• Four Seasons part number 4057R for catalog and service reference

Fitment Details

• Fits 1972 GMC G15/G1500 Van, N/A, w/ A6 Compressor; Compressor w/ 6" Dia. Pulley; 57087 (Reman Compressor), 33211 (Filter Drier), 38683 (Exp Valve), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
• Fits 1972 GMC G25/G2500 Van, N/A, w/ A6 Compressor; Compressor w/ 6" Dia. Pulley; 57087 (Reman Compressor), 33211 (Filter Drier), 38683 (Exp Valve), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
• Fits 1972 GMC G35/G3500 Van, N/A, w/ A6 Compressor; Compressor w/ 6" Dia. Pulley; 57087 (Reman Compressor), 33211 (Filter Drier), 38683 (Exp Valve), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
• Fits 1971 GMC G15/G1500 Van, N/A, w/ A6 Compressor; w/ Rear AC; 57087 (Reman Compressor), 33211 (Filter Drier), 38683 (Exp Valve), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
• Fits 1971 GMC G25/G2500 Van, N/A, w/ A6 Compressor; w/ Rear AC; 57087 (Reman Compressor), 33211 (Filter Drier), 38683 (Exp Valve), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
• Fits 1971 GMC G35/G3500 Van, N/A, w/ A6 Compressor; w/ Rear AC; 57087 (Reman Compressor), 33211 (Filter Drier), 38683 (Exp Valve), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
• Fits 1968-1970 Chevrolet Camaro, N/A, w/ A6 Compressor; Dealer Air; w/ Expansion Valve; Compressor w/ 6" Dia. Pulley; 57087 (Reman Compressor), 33211 (Filter Drier), 38683 (Exp Valve), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
• Fits 1968-1969 Chevrolet Bel Air, N/A, w/ A6 Compressor; Dealer Air; Compressor w/ Single Groove Pulley; Compressor w/ 6" Dia. Pulley; 57087 (Reman Compressor), 33211 (Filter Drier), 38683 (Exp Valve), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
• Fits 1968-1969 Chevrolet Caprice, N/A, w/ A6 Compressor; Dealer Air; w/ Expansion Valve; Compressor w/ Single Groove Pulley; Compressor w/ 6" Dia. Pulley; 57087 (Reman Compressor), 33211 (Filter Drier), 38683 (Exp Valve), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
• Fits 1968-1969 Chevrolet El Camino, N/A, w/ A6 Compressor; Dealer Air; w/ Expansion Valve; Compressor w/ 6" Dia. Pulley; 57087 (Reman Compressor), 33211 (Filter Drier), 38683 (Exp Valve), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
• Fits 1968-1969 Chevrolet Impala, N/A, w/ A6 Compressor; Dealer Air; w/ Expansion Valve; Compressor w/ 6" Dia. Pulley; 57087 (Reman Compressor), 33211 (Filter Drier), 38683 (Exp Valve), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor

What This Kit Helps Address

• Weak or inconsistent cabin cooling on older GM A/C systems
• Compressor noise, seizure, or loss of pumping performance
• Service needs tied to an aging remanufactured compressor replacement
• Restoration work on Chevrolet Camaro, Bel Air, Caprice, El Camino, and Impala A/C systems
• HVAC repair on GMC G-Series vans with A6 compressor applications

Installation Notes

Verify the vehicle’s compressor style, pulley configuration, and A/C system details before ordering. This part is listed for A6 compressor applications with notes that vary by vehicle, including dealer air, rear A/C, expansion valve, single-groove pulley, and 6-inch pulley configurations. For best results, match the application notes exactly to the vehicle being serviced.

Quality Assurance

Four Seasons is a recognized HVAC parts brand, and the PAC-Kit w/ Reman Compressor line is cataloged for application-specific A/C service on classic GM vehicles. Part number 4057R is referenced for direct lookup during compressor replacement and system repair.