Four Seasons 3921NK A/C Compressor and Component Kit - Front

Overview of Four Seasons Complete A/C Kit 3921NK

The Four Seasons Complete A/C Kit 3921NK is designed to restore the air conditioning system in select GM vehicles. This comprehensive kit includes a new compressor and essential components to ensure proper function and reliability for Cadillac, Chevrolet, GMC, and Hummer models.

• Includes new compressor (part 78377) and accumulator (part 83208)
• Compressor oil included for optimal lubrication
• Standard black orifice tube with 0.072 inch diameter
• Receiver drier/accumulator with P-nut fittings and 3.5 inch diameter
• Compatible with R134a refrigerant systems
• Limited lifetime warranty for long-term assurance

Detailed Product Description

This Complete A/C Kit from Four Seasons features a new compressor (part number 78377) that comes pre-filled with the appropriate compressor oil, ensuring proper lubrication and performance from installation. The kit also includes an accumulator (83208) and a standard black orifice tube (38638) with a 0.072 inch diameter, designed to regulate refrigerant flow efficiently. The receiver drier/accumulator measures 3.5 inches in diameter and 8 inches in length, equipped with P-nut inlet and outlet fittings for secure connections. This kit is specifically engineered for vehicles using R134a refrigerant, providing a complete solution for air conditioning system repairs.

About the Four Seasons Complete A/C Kit Line

The Complete A/C Kit product line by Four Seasons offers a full set of components necessary for a comprehensive air conditioning system replacement. This approach simplifies repairs by including a new compressor along with critical parts such as the accumulator and orifice tube, reducing the need for multiple orders and ensuring compatibility. The 3921NK kit is part of this line, tailored for select GM trucks and SUVs to maintain system integrity and performance.

Compatible Vehicles and Applications

This A/C compressor kit is compatible with a range of GM vehicles, including:

• Cadillac Escalade, Escalade ESV, Escalade EXT
• Chevrolet Avalanche 1500, Avalanche 2500, Silverado 1500, Silverado 2500, Silverado 3500, Suburban 1500, Suburban 2500, Tahoe
• GMC Sierra 1500, Sierra 1500 HD, Sierra 2500, Sierra 2500 HD, Sierra 3500, Yukon, Yukon XL 1500, Yukon XL 2500
• Hummer H2

Common Issues Addressed by This Kit

• Compressor failure causing loss of A/C cooling
• Leaks or contamination in the accumulator or receiver drier
• Restricted refrigerant flow due to clogged orifice tube
• Insufficient lubrication leading to compressor damage
• System inefficiency from worn or missing seals and gaskets

Installation Notes and Tips

• Ensure system is properly evacuated and flushed before installation
• Use the included compressor oil to maintain lubrication levels
• Verify correct orientation and secure P-nut fittings on accumulator
• Replace all seals and gaskets included in the kit to prevent leaks
• Confirm compatibility with R134a refrigerant systems prior to installation

Quality Assurance and Warranty

The Four Seasons Complete A/C Kit 3921NK comes with a limited lifetime warranty, providing coverage against defects in materials and workmanship. This warranty supports the durability and reliability expected from a complete air conditioning system replacement kit designed for Cadillac, Chevrolet, GMC, and Hummer vehicles.