Four Seasons 2151NK A/C Compressor and Component Kit

Complete A/C Kit for R4 Applications

Four Seasons 2151NK is a complete air conditioning kit with a new compressor for select GM rear-wheel-drive vehicles using an R4 compressor. It combines the major A/C service components needed for a full repair, including the compressor, accumulator, orifice tube, PAG oil, and O-rings.

Built for R134a systems, this Four Seasons Complete A/C Kit supports direct replacement service on select Buick Regal, Chevrolet Monte Carlo, Chevrolet El Camino, Oldsmobile Cutlass, Oldsmobile Cutlass Salon, Oldsmobile Cutlass Supreme, Pontiac Grand Prix, and Pontiac Bonneville applications.

Key Features

• Four Seasons Complete A/C Kit, part number 2151NK
• Includes a new compressor, accumulator, orifice tube, PAG oil, and O-rings
• Uses PAG Oil /150 for system service
• Designed for R134a refrigerant systems
• Orifice tube style: standard, white, 0.072 in. diameter
• Receiver drier/accumulator dimensions: 3.500 in. diameter, 9.000 in. length
• Accumulator fittings: 0.750 in. inlet and outlet, female insert O-ring inlet, male insert O-ring outlet
• Limited lifetime warranty

Product Details

The Four Seasons Complete A/C Kit line is built for full-system air conditioning service, bringing together the compressor and related replacement parts needed when restoring cooling performance. Part number 2151NK includes compressor 58231, accumulator 33185, orifice tube 38623, oil 59003, and O-rings for a complete A/C repair path on listed vehicles. This kit is a practical choice for owners and technicians servicing older GM platforms with R4 compressor setups, including 1985-1988 Buick Regal, 1985-1988 Oldsmobile Cutlass Supreme, and 1986-1988 Chevrolet Monte Carlo applications.

This part cross-references Four Seasons 2151NK for the same application.

What It Helps Fix

• Weak or inconsistent cabin cooling
• Compressor noise or compressor failure
• Restricted refrigerant flow through the orifice tube
• Moisture or contamination issues in the accumulator
• Leaks at service connections and O-ring sealing points

Installation Notes and Tips

Verify R4 compressor configuration, coil position, and vehicle-specific notes before ordering. Confirm refrigerant type, oil type, and fitting dimensions during service to match the existing system. Replace the accumulator and orifice tube during compressor service, evacuate the system properly, and recharge with the correct R134a specification after repairs.

Fits 1986-1988 Chevrolet Monte Carlo, N/A. Fits 1986-1987 Chevrolet El Camino, N/A. Fits 1985-1987 Buick Regal, N/A. Fits 1985-1988 Oldsmobile Cutlass Supreme, N/A. Fits 1985-1987 Pontiac Grand Prix, N/A. Fits 1985-1986 Pontiac Bonneville, N/A. Fits 1985-1987 Oldsmobile Cutlass Salon, N/A. Fits 1985-1987 Oldsmobile Cutlass, N/A.

Quality Assurance

Four Seasons backs this kit with a limited lifetime warranty. The Complete A/C Kit platform is organized for service-ready replacement of the compressor and related refrigerant circuit components in one application-specific package.