Four Seasons 98575A HVAC Heater Core

Heater Core for Ford and Mercury Applications

The Four Seasons 98575A heater core is an aluminum HVAC replacement built for select Ford and Mercury vehicles with factory heating and air conditioning configurations. It is sized at 7-1/4 inches long, 6 inches wide, and 1-7/8 inches thick to match the listed applications and restore proper cabin heat transfer.

Four Seasons Heater Core line parts are focused on direct-fit HVAC service components for repair work where accurate dimensions and OE-style performance matter. This aluminum heater core meets or exceeds OEM requirements and is listed for multiple classic Ford truck and car applications, including Ford Bronco, Ford F-100, Ford F-150, Ford F-250, Ford F-350, Mustang, and Mercury Cougar.

Key Features

• Part number: 98575A
• Aluminum heater core construction
• Core dimensions: 7-1/4 in. length, 6 in. width, 1-7/8 in. thickness
• Core height: 7.250 in.; core width: 6.000 in.; core depth: 1.875 in.
• Tube size: 0.625 in. / 15.875 mm on both connections
• Meets or exceeds OEM specifications
• Direct HVAC heater core replacement for listed Ford and Mercury fitments

Detailed Description

The Four Seasons 98575A is an aluminum heater core for HVAC service in select 1964-1979 Ford and Mercury vehicles. It is listed for Ford Bronco, Ford F-Series trucks, Mustang, and Mercury Cougar applications with the specified heater and air conditioning configurations. If you are replacing a leaking or restricted heater core in a classic Ford F-100, F-150, F-250, F-350, Mustang, or Bronco, this part number provides a dimensionally matched service solution.

This part cross-references Four Seasons 98575 and 96123 for the same application.

What It Helps Fix

• Weak or uneven cabin heat
• Coolant odor inside the vehicle
• Visible coolant leakage from the HVAC case
• Restricted coolant flow through the heater circuit
• Heat loss caused by a corroded or damaged heater core

Installation Notes and Tips

• Verify the vehicle’s heater and air conditioning configuration before ordering.
• Confirm core dimensions and tube size against the removed unit.
• Inspect heater hoses, clamps, and the HVAC case during replacement.
• Flush the cooling system if contamination or corrosion is present.
• Use the listed fitment details for Ford Bronco, Ford F-Series, Mustang, and Mercury Cougar applications rather than relying on body style alone.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM specifications, supporting accurate fit and dependable HVAC service for the specified applications.