Four Seasons 54275 A/C Evaporator Core - Front

Four Seasons 54275 Evaporator Core Overview

The Four Seasons 54275 evaporator core is an aluminum, plate-and-fin A/C evaporator core built for front HVAC applications on a wide range of classic Chevrolet and GMC trucks and SUVs. It is a direct-fit replacement for many 1977-1991 Chevrolet Blazer, GMC Jimmy, and C/K-series models that use male insert O-ring connections.

As part of the Four Seasons Evaporator Core line, this unit is focused on restoring cabin cooling performance with the correct core dimensions, inlet and outlet fitting style, and OE-style layout for service replacement.

• Part number: 54275
• Aluminum plate-and-fin construction
• Male insert O-ring inlet and outlet fittings
• Core width: 9 in. / 228.600 mm
• Core height: 8-5/8 in. / 219.075 mm
• Core depth: 3-5/8 in. / 92.075 mm
• Outlet fitting outside diameter: No. 12
• Includes Green O-ring service seals referenced by the manufacturer data

Fitment and Application Details

Compatible with front HVAC evaporator core applications on Chevrolet and GMC trucks and SUVs, including Fits 1987-1991 Chevrolet Blazer, Front; Fits 1989-1991 Chevrolet R1500 Suburban, Front; Fits 1989-1991 Chevrolet R2500 Suburban, Front; Fits 1989-1991 Chevrolet R3500, N/A; Fits 1989-1991 Chevrolet V1500 Suburban, Front; Fits 1989-1991 Chevrolet V2500 Suburban, Front; Fits 1989-1991 Chevrolet V3500, N/A; Fits 1978-1991 GMC Jimmy, Front; and additional C/K and R/V-series applications listed for 1977-1991 model years.

This Four Seasons 54275 evaporator core cross-references Four Seasons 6275N and UAC EV6275PFXC for the same application.

What This Evaporator Core Helps Address

• Weak or inconsistent cabin cooling from a restricted or leaking evaporator core
• Refrigerant loss caused by corrosion or damaged core passages
• HVAC performance issues in front A/C systems on Chevrolet and GMC trucks
• Fitment problems when replacing an original male insert O-ring evaporator core
• Service replacement needs for aging C/K, R/V, Blazer, and Jimmy HVAC systems

Installation Notes and Tips

Verify the core width, height, and depth against the original unit before installation. Confirm the inlet and outlet fitting style, outlet fitting outside diameter, and vehicle-specific notes such as the 180-degree outlet fitting requirement on certain 1977 Chevrolet and GMC applications. Inspect the HVAC case, seals, and refrigerant lines for wear before reassembly to help ensure a proper seal.

Quality Assurance

Four Seasons supplies this evaporator core as an OE-style replacement component for HVAC service work. The aluminum plate-and-fin design and application-specific dimensions support accurate replacement on listed Chevrolet and GMC front A/C systems.