Four Seasons 98597A HVAC Heater Core

Four Seasons 98597A Heater Core Overview

The Four Seasons 98597A heater core is an aluminum HVAC replacement built to match the original heater core dimensions for select Ford, Lincoln, and Mercury vehicles. It is specified for 1977-1978 Ford LTD, Lincoln Continental, Mercury Grand Marquis, and Mercury Marquis applications.

With a 6-inch core height, 9-3/4-inch core width, and 2-inch core depth, this heater core is sized for direct-fit service in the heater box. The aluminum core construction supports efficient heat transfer for cabin heating performance.

Key Features

• Brand: Four Seasons Heater Core
• Part number: 98597A
• Aluminum heater core construction
• Core dimensions: 6 in. height, 9-3/4 in. width, 2 in. depth
• Tube size: 0.625 in. / 15.875 mm on both connections
• Meets or exceeds OEM requirements
• Compatible with 1977-1978 Ford LTD, Lincoln Continental, Mercury Grand Marquis, and Mercury Marquis

Product Details

Four Seasons Heater Core 98597A is an aluminum heater core designed for vehicles that need a replacement HVAC heat exchanger with OEM-style dimensions. The aluminum core material helps transfer heat from engine coolant into the cabin air stream, supporting proper defrost and passenger compartment heating. This part cross-references APDI 9010097 and Spectra Premium 94597 for the same application.

Fits 1977-1978 Ford LTD, N/A. Fits 1977-1978 Lincoln Continental, N/A. Fits 1977-1978 Mercury Grand Marquis, N/A. Fits 1977-1978 Mercury Marquis, N/A.

Common Problems This Part Can Address

• Weak or uneven cabin heat
• Coolant odor inside the vehicle
• Fogging or poor windshield defrost performance caused by heater core issues
• Coolant leakage from the HVAC heater core area
• Restricted heat output from a corroded or damaged core

Installation Notes and Tips

Verify heater core dimensions, tube size, and vehicle fitment before installation. Inspect heater hoses, clamps, and the HVAC case for wear or contamination while replacing the core. Proper coolant system service and air bleeding after installation help restore normal heater operation.

Quality Assurance

This Four Seasons heater core meets or exceeds OEM requirements and is built as an aluminum replacement for the listed applications. Confirm part number 98597A against the vehicle’s original heater core specifications before ordering.