Four Seasons 54863 A/C Evaporator Core - Front

Four Seasons 54863 A/C Evaporator Core

Four Seasons 54863 is an aluminum plate-and-fin A/C evaporator core built for front HVAC service on select GM, Buick, Saab, and Isuzu applications. With a 11.000-inch width, 10.125-inch height, and 2.875-inch core depth, it is sized for direct replacement work where the original evaporator core has failed or lost cooling efficiency.

This Four Seasons evaporator core uses block fittings at both the inlet and outlet and includes slimline washer O-ring references for the connection points. The Four Seasons Evaporator Core line focuses on replacement HVAC components for service technicians and repair shops working on vehicle air conditioning systems.

Key Features

• Part number 54863 for A/C evaporator core replacement
• Aluminum plate-and-fin construction
• Block fitting inlet and outlet design
• Core dimensions: 11.000 in. wide, 10.125 in. high, 2.875 in. deep
• Front HVAC application coverage on select Trailblazer, Envoy, Rainier, SSR, Bravada, Ascender, and 9-7x models
• Cross-reference part numbers include Spectra Premium 1010008 and TYC 97082

Detailed Description

Four Seasons 54863 is an HVAC evaporator core for vehicles that rely on a front-mounted evaporator assembly to cool cabin air. The aluminum plate-and-fin design supports efficient heat transfer in the air conditioning system, while the block fitting configuration matches the listed OE-style connection layout. This part number 54863 is listed for 2003-2009 Chevrolet Trailblazer, 2003-2009 GMC Envoy, 2005-2009 Saab 9-7x, 2003-2008 Isuzu Ascender, 2004-2007 Buick Rainier, 2003-2006 Chevrolet SSR, 2003-2006 Chevrolet Trailblazer EXT, 2003-2006 GMC Envoy XL, 2004-2005 GMC Envoy XUV, and 2003-2004 Oldsmobile Bravada. It is a direct-fit style replacement for front HVAC service on these applications.

This part cross-references Spectra Premium 1010008 and TYC 97082 for the same application.

What It Helps Address

• Weak or inconsistent cabin cooling
• Refrigerant loss at the evaporator core
• Restricted airflow through a damaged core
• Interior A/C performance issues tied to a leaking or corroded evaporator
• HVAC service needs on Chevrolet Trailblazer, GMC Envoy, and Buick Rainier models

Installation Notes and Tips

Replacement of an A/C evaporator core often requires extended labor, specialized tools, and HVAC service experience. Confirm the block fitting layout, core dimensions, and vehicle-specific front HVAC configuration before installation. Proper evacuation, leak checking, and system recharge procedures should be followed after service. For Chevrolet SSR applications, evaporator replacement may require considerable time, specialty tools, and training.

Quality Assurance

Four Seasons supplies HVAC replacement components for professional repair use, and this evaporator core is built to match the listed application requirements and dimensional specifications for the covered vehicles.