Four Seasons 57256 A/C Compressor

Reman A/C Compressor for GM Applications

Four Seasons 57256 is a remanufactured GM A/C compressor built for R134a systems using PAG 150 oil. It is listed as a non-clutch compressor with a high pressure switch, making it a direct replacement choice for a wide range of Buick, Chevrolet, GMC, Oldsmobile, and Pontiac vehicles.

Compatible With 1983-1991 Buick Century, 1987-1991 Chevrolet Blazer, and 1985-1991 GMC Jimmy applications that use HR6 or DA6 compressor setups. The Four Seasons Reman Compressor line focuses on OE-style replacement coverage for older GM HVAC systems.

Key Features

• Part number: 57256
• Remanufactured A/C compressor for GM vehicles
• Refrigerant type: R134a
• Compatible refrigerant oil: PAG 150
• Compressor types: HR6, DA6
• Non-clutch design; clutch not included
• 6-groove pulley with non-clutch belt type
• High pressure switch included
• Block mount suction port with O-rings and sealing washer
• Type III metric thread mounting

Product Details

Four Seasons 57256 is a reman A/C compressor for GM HVAC systems that require an HR6 or DA6 style unit. It uses a 6-groove pulley, a block-mount suction port, and Type III metric thread mounting. The compressor is supplied without a clutch and includes a high pressure switch, along with two green O-rings for sealing at the suction port connection. This part cross-references Gates 1450 for the same application.

Vehicle coverage includes many GM cars and trucks from 1983-1991, including Buick Century, Buick LeSabre, Chevrolet C/K and R/V series trucks, GMC C/K and R/V series trucks, Oldsmobile Cutlass Ciera, and Pontiac 6000. Use Four Seasons 57256 when replacing a worn or failed compressor in an R134a-converted or service-ready GM air conditioning system.

Common Problems This Part Can Address

• No cold air from the A/C vents
• Compressor noise, seizure, or internal wear
• Refrigerant loss at the compressor connection points
• High pressure switch-related A/C system faults
• Poor belt-driven compressor operation on GM HR6/DA6 systems

Installation Notes and Tips

Confirm compressor type, pulley groove count, and mounting style before installation. This unit is for R134a systems and should be paired with PAG 150 oil as specified. Replace the included O-rings and sealing washer at the suction port, evacuate the system, and verify proper refrigerant charge after installation. Because the clutch is not included, reuse or source the correct clutch assembly only if your application requires one.

Quality Assurance

Four Seasons remanufactured compressors are rebuilt for replacement use in GM HVAC applications and are cataloged for direct fitment across the listed Buick, Chevrolet, GMC, Oldsmobile, and Pontiac models. Part number 57256 is also listed under multiple interchange references, including Remy 12970 and Wix 33395.