Four Seasons 98590A HVAC Heater Core

Heater Core for Ford Thunderbird and Lincoln Continental

Restore cabin heat with this Four Seasons Heater Core, part number 98590A. Built with an aluminum core and OE-style dimensions, it is a direct-fit HVAC heater core for select 1967-1972 Ford Thunderbird and 1970-1972 Lincoln Continental applications.

Key Features

• Four Seasons Heater Core line
• Part number 98590A
• Aluminum heater core construction
• Core dimensions: 8-3/4 in. length, 6 in. width, 1-7/8 in. thickness
• Tube sizes: 0.625 in. and 0.750 in.
• Meets or exceeds OEM requirements
• Direct replacement for HVAC heater core service

Product Details

The Four Seasons 98590A heater core is engineered for vehicles that rely on a compact aluminum heat exchanger to transfer engine heat into the cabin HVAC system. Its 8.750 in. core height, 6.000 in. core width, and 1.875 in. core depth support OE-style fitment, while the fixed pipe positioning helps maintain the original hose routing. This heater core is listed for 1967-1971 Ford Thunderbird and 1970-1972 Lincoln Continental models, making it a focused replacement for classic Ford and Lincoln climate control repair. This part cross-references APDI 9010056 for the same application.

Common Problems This Part Can Address

• Weak or no cabin heat from a restricted heater core
• Coolant odor inside the passenger compartment from a leaking core
• Window fogging caused by heater core seepage
• Uneven HVAC performance due to internal blockage
• Loss of heater efficiency in Ford Thunderbird and Lincoln Continental models

Installation Notes and Tips

Verify hose diameter, tube orientation, and core dimensions against the removed unit before installation. Flush the cooling system and inspect hoses, clamps, and the heater control valve for wear or contamination before reassembly. Because this heater core uses fixed pipe positioning, confirm the original routing matches the vehicle application before final fitment. Fits 1967-1971 Ford Thunderbird, N/A. Fits 1970-1972 Lincoln Continental, N/A.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM requirements. The aluminum construction and application-specific sizing support consistent replacement quality for classic Ford Thunderbird and Lincoln Continental HVAC repair.