Four Seasons 54666 A/C Evaporator Core

Four Seasons 54666 Evaporator Core Overview

The Four Seasons 54666 evaporator core is an aluminum A/C evaporator core built for HVAC service where precise fit and refrigerant-side sealing matter. It is listed for 1983-1985 Nissan 720 applications and uses a serpentine core design for efficient airflow through the HVAC case.

Four Seasons Evaporator Core line parts are focused on direct replacement dimensions and connection styles, helping restore cabin cooling performance in the original air conditioning system. This Four Seasons 54666 evaporator core is a fitment-based replacement for Nissan 720 models from 1983 through 1985.

Key Features

• Aluminum evaporator core construction
• Serpentine core design
• Core width: 8 in. (203.2 mm)
• Core height: 8-1/2 in. (215.9 mm)
• Core depth: 4 in. (101.6 mm)
• Inlet fitting: No. 8 female O-ring
• Outlet fitting: No. 10 male insert O-ring
• Includes Green O-Ring sealing points for the listed connections

Detailed Description

Built as an A/C evaporator core for the HVAC system, this Four Seasons part number 54666 uses aluminum construction and a serpentine layout to match the physical and connection requirements of the original evaporator assembly. The listed dimensions and fitting types are important for proper case fitment and refrigerant line connection on 1983-1985 Nissan 720 models. This part cross-references Bosch 6718 for the same application.

Compatible With 1983-1985 Nissan 720, N/A. Use this evaporator core when replacing a leaking, restricted, or damaged unit in the vehicle’s air conditioning system. Four Seasons 54666 is also referenced by part number 54666 in catalog listings for the same application.

What This Part Helps Address

• Loss of cabin cooling caused by a leaking evaporator core
• Reduced A/C performance from internal blockage or restriction
• Refrigerant odor or residue from a failed core
• HVAC system inefficiency caused by damaged evaporator passages
• Fitment issues when replacing the original Nissan 720 evaporator core

Installation Notes and Tips

Verify the core width, height, depth, and fitting orientation before installation. Match the inlet and outlet fitting styles to the vehicle’s refrigerant lines, and inspect the O-ring sealing surfaces during service. Because this is an HVAC evaporator core, proper evacuation, leak checking, and recharge procedures should be followed after installation.

For 1983-1985 Nissan 720 A/C repair, confirm the existing evaporator case and line connections match the listed dimensions and No. 8 / No. 10 fitting configuration before assembly.

Quality Assurance

Four Seasons catalogs this evaporator core as a direct replacement HVAC component for the listed Nissan 720 applications. The part number 54666 is supported by catalog interchange references for application matching and identification.