Four Seasons 98581A HVAC Heater Core

Four Seasons 98581A Heater Core Overview

Four Seasons 98581A is an aluminum HVAC heater core built for direct replacement in select Ford, Mercury, and Lincoln applications. It is listed as meeting or exceeding OEM requirements and is sized for vehicles equipped with air conditioning.

The Four Seasons Heater Core line focuses on accurate fit and dependable heat transfer for cabin climate control service. This 98581A heater core uses an aluminum core construction with fixed pipe positioning for a straightforward replacement in the correct application.

Key Features

• Aluminum heater core construction
• Core dimensions: 6 in. height, 9-3/8 in. width, 1-7/8 in. thickness
• Tube sizes: 5/8 in. and 3/4 in.
• Fixed pipe positioning
• Meets or exceeds OEM specifications
• Direct-fit HVAC heater core for selected air-conditioned vehicles

Detailed Product Description

Four Seasons 98581A is an HVAC heater core designed for vehicles that rely on the heater core to transfer engine heat into the cabin air stream. The aluminum core material supports efficient heat exchange while keeping the unit compact for the specified dash and HVAC housing dimensions. This part number is listed for 1973-1976 Lincoln Continental, 1975-1976 Ford LTD, 1975-1976 Mercury Grand Marquis, 1975-1976 Mercury Marquis, and 1979 Lincoln Continental applications equipped with air conditioning.

For buyers searching for a heater core for 1975 Ford LTD with air conditioning, a 1976 Mercury Marquis heater core replacement, or a 1973-1976 Lincoln Continental HVAC heater core, Four Seasons 98581A provides a direct replacement option. This part cross-references APDI 9010289 for the same application.

Common Problems This Part Can Address

• Weak or uneven cabin heat output
• Coolant seepage from a worn heater core
• Restricted heat transfer inside the HVAC system
• Replacement needs after corrosion or internal blockage
• Restoring heater performance in air-conditioned classic Ford, Mercury, and Lincoln models

Installation Notes and Tips

Verify the vehicle’s year, make, model, and air conditioning configuration before ordering. Compare the core height, width, thickness, and tube sizes to the original unit to confirm proper fitment. Because heater core replacement often requires access through the HVAC case, inspect related hoses, seals, and coolant condition during service.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM requirements. The aluminum construction and application-specific dimensions support accurate replacement in the listed Ford, Mercury, and Lincoln vehicles.