Four Seasons 54771 A/C Evaporator Core

Four Seasons 54771 Evaporator Core Overview

Four Seasons 54771 is an aluminum plate & fin A/C evaporator core for select Nissan and INFINITI applications. It is built around the core dimensions and block-fitting layout needed for direct replacement service in the HVAC system.

Compatible With 1996-2004 Nissan Pathfinder, 1997-2003 INFINITI QX4, 2004 Nissan Pathfinder Armada, and 1999 INFINITI G20, this evaporator core supports repair work where cabin cooling performance has declined. The Four Seasons Evaporator Core line focuses on replacement HVAC components for vehicle-specific fitment, and part number 54771 is listed across multiple interchange references for the same application.

Key Features

• Aluminum plate & fin evaporator core construction
• Block fitting inlet and outlet connection style
• Core dimensions: 9-1/4 in. width, 10-1/16 in. height, 2-7/8 in. depth
• Metric core size: 234.950 mm x 255.588 mm x 73.025 mm
• Includes green O-ring sealing references for the A and B connections
• Four Seasons 54771 evaporator core for HVAC service and replacement

Detailed Description

This Four Seasons evaporator core is a replacement HVAC component engineered around the listed dimensions and block-fitting configuration. The aluminum plate & fin design is used in A/C evaporator service where refrigerant flow and heat transfer through the cabin HVAC case are critical. For Nissan Pathfinder and INFINITI QX4 applications, the part number 54771 provides a direct-reference option for restoring evaporator function in the air conditioning system.

This part cross-references Gates 6954 for the same application. Four Seasons 54771 also appears in interchange listings tied to OE and aftermarket reference numbers, making it easier to match against existing service records or removed components.

Common Repair Reasons

• Weak or inconsistent cabin cooling
• Refrigerant leak at the evaporator core
• Corrosion or internal damage in the HVAC evaporator
• Restricted airflow through the A/C evaporator assembly
• Need for a replacement evaporator core during HVAC repair

Installation Notes and Tips

Replacement of this A/C evaporator core may require extended labor, specialized tools, and HVAC system expertise, especially on 2004 Nissan Pathfinder and 2004 Nissan Pathfinder Armada applications. Verify the block-fitting layout, core dimensions, and vehicle-specific HVAC configuration before installation. Proper evacuation, leak checking, and system recharge procedures should be followed after service.

Quality Assurance

Four Seasons supplies HVAC replacement parts for vehicle-specific applications, and this evaporator core is listed with defined dimensions, material, and fitting details to support accurate part matching. Confirm the part number 54771 against the removed component and vehicle fitment before installation.