Four Seasons 5607NK A/C Compressor and Component Kit

Complete A/C Kit for 1988 GM Trucks

Restore cooling performance with the Four Seasons Complete A/C Kit, part number 5607NK. This complete air conditioning kit with a new compressor is built for select 1988 Chevrolet and GMC C/K trucks equipped with R4 or LTR4 compressor setups, including applications for Chevrolet C1500, C2500, C35, C3500, K1500, K2500, and K3500, plus GMC C1500, C2500, C3500, K1500, K2500, and K3500.

The Four Seasons Complete A/C Kit line is organized to simplify major HVAC service by combining the compressor, accumulator, orifice tube, oil, and O-rings in one package. Part number 5607NK is set up for R134a refrigerant systems and uses PAG Oil /150 for compressor lubrication.

Key Features

• Four Seasons 5607NK complete A/C compressor kit
• Includes a new compressor, accumulator, orifice tube, oil, and O-rings
• Uses R134a refrigerant
• PAG Oil /150 included
• Orifice tube style: standard, white, 0.072 in. diameter
• Accumulator dimensions: 3.500 in. diameter, 8.000 in. length
• Accumulator inlet/outlet fittings: female O-ring and male insert O-ring
• Limited lifetime warranty

Detailed Description

Four Seasons 5607NK is a complete air conditioning kit for select 1988 Chevrolet C1500, C2500, C35, C3500, K1500, K2500, and K3500 trucks, as well as GMC C1500, C2500, C3500, K1500, K2500, and K3500 trucks. It is configured for vehicles using an R4 or LTR4 compressor, including listed applications with an LTR4 compressor without an inertia ring. This kit is designed around the core service parts needed when replacing a failed compressor and related A/C components on GM truck HVAC systems.

The kit includes compressor oil, gasket and seal components, and an orifice tube matched to the listed system specifications. This part cross-references 520166 for the same application.

Common Problems This Kit Can Address

• Loss of cabin cooling from a worn or seized compressor
• Contaminated or low compressor oil after A/C system failure
• Restricted refrigerant flow caused by a worn or incorrect orifice tube
• Moisture-related service issues in the accumulator section
• Leaking seals at serviced A/C connections

Installation Notes and Tips

Before installation, verify compressor style, refrigerant type, and fitting configuration against the vehicle’s existing HVAC system. Flush the system as needed after compressor failure, replace the accumulator and orifice tube during service, and charge the system with the correct amount of R134a refrigerant and PAG Oil /150. Confirm all O-rings and sealing surfaces are clean before assembly.

Quality Assurance

Four Seasons backs this kit with a limited lifetime warranty. Part number 5607NK is built as a complete A/C service solution for 1988 Chevrolet and GMC truck applications, with components selected to match the listed compressor and accumulator specifications.