Four Seasons 3878N A/C Compressor Kit

Four Seasons PAC-Kit w/ New Compressor 3878N

Four Seasons 3878N is an A/C compressor kit for select Hyundai Sonata and Kia Optima applications with an HS18 compressor. This PAC-Kit w/ New Compressor is built for vehicles that need a compressor-focused HVAC service solution with related A/C service components specified by the application.

Key Features

• Four Seasons PAC-Kit w/ New Compressor line
• Part number 3878N
• For select 1999-2002 Hyundai Sonata applications
• For 2001 Kia Optima applications
• Application notes specify HS18 compressor fitment
• Includes fitment-specific service references for the listed vehicle applications

Fitment Details

Compatible With 2002 Hyundai Sonata, w/ HS18 Compressor; to 11/02. Compatible With 1999-2001 Hyundai Sonata, w/ HS18 Compressor. Compatible With 2001 Kia Optima, w/ HS18 Compressor.

The Four Seasons PAC-Kit w/ New Compressor product line is organized for application-specific HVAC repair, helping match the compressor assembly to the vehicle’s listed A/C system requirements. For shoppers searching for a Hyundai Sonata A/C compressor kit or a Kia Optima compressor replacement, 3878N provides a direct fitment reference for the stated HS18-equipped vehicles.

What It Is Used For

• Replacing a worn or failed A/C compressor on listed Hyundai Sonata models
• Replacing a worn or failed A/C compressor on the listed Kia Optima application
• Restoring refrigerant circulation in an HS18-equipped HVAC system
• Addressing compressor noise, seizure, or loss of cooling output
• Supporting a complete A/C service on the specified vehicle applications

Installation Notes and Tips

Verify the vehicle’s compressor type and build date before ordering. The fitment notes for the 2002 Hyundai Sonata specify use through 11/02, so confirm the original HS18 compressor configuration against the vehicle identification data. Follow standard A/C service procedures, including system evacuation, flushing where required, and correct oil handling for the application.

Quality Assurance

Four Seasons is a recognized HVAC parts brand, and this kit is cataloged for the exact vehicle applications listed above. Part number 3878N should be matched to the compressor type and fitment notes before installation.