Four Seasons 3734NK A/C Compressor and Component Kit - Front

Complete A/C Kit for Trailblazer, Envoy, and 9-7x

Four Seasons Complete A/C Kit 3734NK is a complete air conditioning kit with a new compressor for front HVAC service on select Chevrolet, GMC, and Saab applications. It is built for vehicles using a TRSA12 compressor and without rear A/C, making it a direct-fit service solution for common compressor and cooling circuit repairs.

The Four Seasons Complete A/C Kit line brings together the major A/C service components needed for a front system repair in one package. This kit includes a new compressor, accumulator, orifice tube, oil, and O-rings, with R134a refrigerant system compatibility and a limited lifetime warranty.

Key Features

• Four Seasons Complete A/C Kit, part number 3734NK
• Complete air conditioning kit with new compressor
• Includes compressor oil and O-rings
• Uses a standard black orifice tube, 0.072 in. diameter
• Receiver drier/accumulator included with P-nut inlet and outlet fittings
• Designed for R134a refrigerant systems
• Limited lifetime warranty
• Fits front HVAC applications with TRSA12 compressor and without rear A/C

Detailed Description

Four Seasons 3734NK is a Complete A/C Kit for front air conditioning service on 2004-2009 Chevrolet Trailblazer, 2004-2006 Chevrolet Trailblazer EXT, 2004-2009 GMC Envoy, 2004-2006 GMC Envoy XL, 2004-2005 GMC Envoy XUV, and 2005-2009 Saab 9-7x. It is specified for vehicles with a TRSA12 compressor and without rear A/C. The kit includes a new compressor, accumulator, orifice tube, oil, and O-rings to support a full system repair on the listed applications.

This part cross-references 520568 and MK1052 for the same application.

What This Kit Helps Address

• Loss of A/C cooling from compressor wear or failure
• Contaminated or inefficient compressor operation
• Restricted refrigerant flow through the orifice tube
• Moisture control issues in the accumulator circuit
• Seal leakage at service connections and system joints

Installation Notes and Tips

Verify the vehicle uses a TRSA12 compressor and does not have rear A/C before installation. Replace the accumulator, orifice tube, and O-rings during service, and confirm the system is evacuated and charged with the correct R134a refrigerant specification after repair. Check all fittings and line connections for proper seating before returning the vehicle to service.

Quality Assurance

Four Seasons 3734NK is backed by a limited lifetime warranty. The kit is built as a complete A/C service package for the listed Chevrolet Trailblazer, GMC Envoy, and Saab 9-7x front applications, with the major replacement components selected for the specified system configuration.