Four Seasons 98787 HVAC Heater Core

Four Seasons 98787 Heater Core Overview

The Four Seasons Heater Core 98787 is an aluminum HVAC heater core built to meet or exceed OEM requirements. With a 5-7/8 in. core height, 8-5/8 in. core width, and 1-3/4 in. core depth, it is sized for direct replacement applications that require accurate fit and dependable heat transfer. This heater core is a practical choice for Ford and Mercury vehicle heating system repairs where the original core has failed.

Four Seasons Heater Core line products are focused on replacement HVAC components that match factory-style dimensions and construction. Part number 98787 uses an aluminum core design with 5/8 in. inlet and outlet tubes and fixed pipe positioning for straightforward service replacement.

Key Features

• Four Seasons part number 98787 heater core
• Aluminum heater core construction for efficient heat transfer
• Core dimensions: 5-7/8 in. height, 8-5/8 in. width, 1-3/4 in. depth
• 5/8 in. tube size on both connections
• Meets or exceeds OEM specifications
• Fixed pipe positioning for OE-style replacement fitment

Product Details

This HVAC heater core is used in the vehicle’s heating system to transfer engine coolant heat into the cabin air stream. The aluminum core construction supports consistent thermal performance, while the listed dimensions help ensure the replacement matches the original heater box layout. Cross-reference part numbers for the same application include UAC HT400036C and AMS Automotive 6859.

Fits 1980-1986 Ford F-150, 1980-1986 Ford F-250, 1980-1986 Ford F-350, 1980-1986 Ford Bronco, 1980-1986 Ford Econoline, 1980-1986 Ford E-150, 1980-1986 Ford E-250, 1980-1986 Ford E-350, 1980-1986 Ford Ranger, 1980-1986 Ford Mustang, 1980-1986 Ford Thunderbird, 1980-1986 Ford LTD, 1980-1986 Ford Crown Victoria, 1980-1986 Ford Granada, 1980-1986 Ford Fairmont, 1980-1986 Ford Pinto, 1980-1986 Ford Maverick, 1980-1986 Ford Torino, 1980-1986 Ford Ranchero, 1980-1986 Ford Bronco II, 1980-1986 Ford Escort, 1980-1986 Ford Tempo, 1980-1986 Ford Taurus, 1980-1986 Ford Aerostar, 1980-1986 Ford Club Wagon, 1980-1986 Ford F-100, 1980-1986 Ford F-600, 1980-1986 Ford F-700, 1980-1986 Ford F-800, 1980-1986 Mercury Cougar, 1980-1986 Mercury Marquis, 1980-1986 Mercury Zephyr, 1980-1986 Mercury Capri, 1980-1986 Mercury Bobcat, 1980-1986 Mercury Monarch, 1980-1986 Mercury Colony Park, 1980-1986 Mercury Grand Marquis, 1980-1986 Mercury Lynx, 1980-1986 Mercury Topaz, 1980-1986 Mercury Sable, 1980-1986 Mercury Villager, 1980-1986 Lincoln Continental, 1980-1986 Lincoln Town Car, 1980-1986 Lincoln Mark VII, 1980-1986 Lincoln Mark VI, 1980-1986 Lincoln Versailles, 1980-1986 Lincoln Navigator, 1980-1986 Lincoln Blackwood, 1980-1986 Mazda B-Series, 1980-1986 Mazda B2000, 1980-1986 Mazda B2200, 1980-1986 Mazda B2600, 1980-1986 Mazda GLC, 1980-1986 Mazda RX-7, 1980-1986 Mazda 626, 1980-1986 Mazda 929, 1980-1986 Mazda MPV, 1980-1986 Mazda Navajo, 1980-1986 Mazda Tribute, 1980-1986 Mazda Protege, 1980-1986 Mazda Millenia, 1980-1986 Mazda MX-6, 1980-1986 Mazda MX-3, 1980-1986 Mazda CX-7, 1980-1986 Mazda CX-9, 1980-1986 Mazda CX-5, 1980-1986 Mazda CX-3, 1980-1986 Mazda CX-30, 1980-1986 Mazda CX-50, 1980-1986 Mazda B2300, 1980-1986 Mazda B3000, 1980-1986 Mazda B4000, 1980-1986 Mazda Tribute, 1980-1986 Ford Mustang, front.

Common Repair Uses

• Restores cabin heat when the original heater core is leaking
• Addresses coolant odor or damp carpet caused by heater core failure
• Helps correct weak or uneven defrost performance
• Replaces a clogged core that restricts coolant flow through the HVAC system
• Supports repair of temperature control issues tied to internal heater core blockage

Installation Notes

Verify core dimensions, tube size, and pipe orientation before installation. Flush the cooling system and inspect hoses, clamps, and the heater control valve if equipped, since contamination or restriction can shorten the life of the replacement core. Confirm vehicle-specific HVAC box access and compare the removed part to Four Seasons 98787 before reassembly.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM requirements, making it a direct replacement option for service work on Ford and Mercury heating systems. The aluminum construction and OE-style dimensions support consistent fitment and thermal performance in the intended applications.