Four Seasons 54591 A/C Evaporator Core

Four Seasons 54591 Evaporator Core Overview

Four Seasons 54591 is an aluminum plate-and-fin A/C evaporator core for select Buick and Oldsmobile applications. It is built to match the listed core dimensions and O-ring style connections for a direct-service HVAC repair on 1994-1996 Buick Century and 1994-1996 Oldsmobile Cutlass Ciera, plus 1994 Oldsmobile Cutlass Cruiser.

Key Features

• Aluminum plate & fin evaporator core construction
• Core width: 13-5/8 in. (346.075 mm)
• Core height: 6-1/4 in. (158.750 mm)
• Core depth: 3-9/16 in. (90.487 mm)
• Male insert O-ring inlet and outlet fittings
• Inlet fitting outside diameter: No. 8
• Outlet fitting outside diameter: No. 12
• Four Seasons evaporator core part number 54591

Product Details

Four Seasons Evaporator Core 54591 is part of the brand’s evaporator core line and is specified with aluminum construction for HVAC service work. The listed dimensions, fitting types, and core measurements help match the evaporator to the vehicle’s air conditioning case and refrigerant line connections. This part cross-references UAC EV6740PFC for the same application.

Compatible With 1994-1996 Buick Century, 1994-1996 Oldsmobile Cutlass Ciera, and 1994 Oldsmobile Cutlass Cruiser. Use Four Seasons 54591 when replacing a leaking or restricted evaporator core in these applications.

Common Problems This Part Can Address

• Loss of cabin cooling from an internally leaking evaporator core
• Reduced A/C performance caused by refrigerant flow restriction
• Moisture-related odor or residue inside the HVAC case
• Corrosion or damage to the original aluminum core
• Service replacement after HVAC system disassembly

Installation Notes and Tips

Verify the core width, height, and depth against the original unit before installation. Confirm male insert O-ring inlet and outlet connections match the vehicle’s refrigerant line fittings, and inspect the HVAC case, seals, and expansion device during service. Proper evacuation and recharge procedures are required after evaporator replacement.

Quality Assurance

Four Seasons supplies HVAC replacement components with application-specific dimensions and fitting details to support accurate service replacement. Part number 54591 is listed with OE-style dimensional data for the covered Buick and Oldsmobile applications.