Four Seasons 98521 HVAC Heater Core

Heater Core for Ford Trucks and Bronco

Four Seasons 98521 is an aluminum HVAC heater core built for select Ford Bronco and Ford F-Series applications with standard output heating and no air conditioning. It measures 7-1/4 inches high, 6 inches wide, and 1-7/8 inches deep, with 5/8-inch inlet and outlet tubes for a direct-fit replacement in the listed vehicles.

The Four Seasons Heater Core line focuses on OE-style replacement parts for heating system service. This aluminum heater core meets or exceeds OEM requirements and is sized for the factory heater case in the specified Ford truck and Bronco applications.

Key Features

• Part number: 98521
• Four Seasons Heater Core product line
• Aluminum core construction
• Core dimensions: 7-1/4 in. x 6 in. x 1-7/8 in.
• 5/8-inch tube connections
• Meets or exceeds OEM specifications
• Direct replacement for select Ford heating systems without AC

Detailed Description

Four Seasons 98521 is an HVAC heater core designed for vehicles that use a standard output heater and do not have air conditioning. The aluminum core construction supports efficient heat transfer in the factory heater assembly, while the listed dimensions and tube sizes help match the original fitment. This part cross-references Spectra Premium 94521 for the same application.

Compatible With 1980-1984 Ford Bronco, 1980-1984 Ford F-150, 1980-1984 Ford F-250, 1980-1984 Ford F-350, 1980-1983 Ford F-100, 1985-1986 Ford Bronco, 1985-1986 Ford F-150, 1985-1986 Ford F-250, 1985-1986 Ford F-350, and 1986 Ford F-200, with the notes shown in the fitment data. Search terms such as Ford Bronco heater core replacement, Ford F-150 heater core for no AC, and 1980s Ford truck HVAC heater core all point to this application.

Common Problems This Part Can Address

• Weak or inconsistent cabin heat
• Coolant seepage from the heater core area
• Restricted heat output from a clogged core
• Fogging or sweet coolant odor inside the cabin
• Service replacement for a leaking or corroded factory heater core

Installation Notes and Tips

Verify the vehicle’s heater configuration before ordering, since this part is listed for standard heater systems without air conditioning. Confirm the core dimensions and 5/8-inch tube size against the original unit before installation. Inspect heater hoses, clamps, and the heater case for wear or corrosion during service so the replacement can be installed into a clean, sealed system.

Quality Assurance

This Four Seasons heater core is listed as meeting or exceeding OEM requirements. The aluminum construction and OE-style sizing support factory-style replacement service for the specified Ford Bronco and Ford F-Series applications.