Four Seasons 98481 HVAC Heater Core

Four Seasons 98481 Heater Core Overview

The Four Seasons 98481 heater core is an aluminum HVAC heater core built for direct replacement service in select GM applications. It is engineered to meet or exceed OEM requirements and is sized for vehicles with Automatic Temperature Control (ATC), including Buick LeSabre, Oldsmobile 98, Oldsmobile Delta 88, and Pontiac Bonneville applications.

Four Seasons Heater Core 98481 is part of the brand’s heater core line, focused on replacement HVAC core construction with application-specific dimensions and tube sizing for proper fitment in the heater box.

Key Features

• Aluminum heater core construction
• Meets or exceeds OEM requirements
• Core dimensions: 6-3/4 in. length, 7-1/2 in. width, 1-7/8 in. thickness
• Core height: 6.750 in.; core width: 7.500 in.; core depth: 1.875 in.
• Two 0.750 in. (19.050 mm) tubes
• Adjustable pipe positioning: No
• Direct-fit HVAC heater core for select ATC-equipped vehicles

Detailed Description

Four Seasons 98481 is an aluminum heater core designed for HVAC repair where the original core has leaked, restricted coolant flow, or no longer transfers heat effectively. Its compact core size and fixed pipe positioning support a precise replacement in the heater case, while the aluminum core material helps maintain efficient heat exchange. This part cross-references Spectra Premium 94481 and APDI 9010203 for the same application.

Fits 1986-1990 Buick LeSabre, N/A; Fits 1986-1990 Oldsmobile 98, N/A; Fits 1986-1990 Oldsmobile Delta 88, N/A; Fits 1987-1990 Pontiac Bonneville, N/A. These applications are noted as compatible with HVAC systems featuring Automatic Temperature Control (ATC).

Common Problems This Part Can Address

• Loss of cabin heat from a leaking or clogged heater core
• Coolant odor or moisture inside the passenger compartment
• Poor defrost performance caused by reduced heater output
• Uneven or weak heat delivery through the HVAC system
• Replacement of a damaged original heater core during HVAC service

Installation Notes and Tips

Verify heater core dimensions, tube size, and pipe orientation against the removed part before installation. Confirm ATC-equipped HVAC system compatibility for the vehicle and inspect related hoses, seals, and coolant condition during service. Proper bleeding of the cooling system after installation helps restore normal heater performance.

Quality Assurance

Four Seasons 98481 is built as an OEM-level replacement heater core and is listed as meeting or exceeding OEM requirements for the specified applications.