Four Seasons 98574A HVAC Heater Core

Four Seasons 98574A Heater Core Overview

Four Seasons 98574A is an aluminum HVAC heater core built for direct-fit replacement in select Ford and Mercury applications. It is sized at 7-3/4 inches long, 6 inches wide, and 2 inches thick, with 0.625-inch inlet and outlet tubes for a straightforward service replacement.

Compatible With 1967-1973 Ford Mustang, 1969-1973 Mercury Cougar, 1969 Mercury Montego, and 1971-1973 Ford Pinto applications, this heater core meets or exceeds OEM requirements and supports factory-style cabin heat performance. The Four Seasons Heater Core line focuses on replacement parts for heating and cooling service, and part number 98574A is listed alongside Four Seasons 98574 for the same application.

Key Features

• Aluminum heater core construction
• Core dimensions: 7.750 in. height, 6.000 in. width, 2.000 in. depth
• 0.625 in. tube size on both connections
• Meets or exceeds OEM specifications
• Direct replacement for select Ford Mustang, Mercury Cougar, Mercury Montego, and Ford Pinto models
• Four Seasons part number 98574A

Detailed Description

This HVAC heater core transfers engine heat into the passenger compartment through the vehicle’s heater system. The aluminum core material supports efficient heat exchange and is matched to the listed dimensions for service replacement in vehicles equipped with or without air conditioning, depending on model year and application. For buyers searching for a Ford Mustang heater core, Mercury Cougar heater core, or Ford Pinto heater core, 98574A provides a fitment-specific option for the listed years.

This part cross-references Four Seasons 98574 for the same application.

Common Problems This Part Can Address

• Weak or uneven cabin heat output
• Coolant leakage from the heater core assembly
• Restricted coolant flow through the heater circuit
• Fogging or sweet odor caused by heater core failure
• Loss of defrost performance tied to poor heater operation

Installation Notes and Tips

• Verify vehicle year, make, model, and air conditioning configuration before ordering.
• Inspect heater hoses, clamps, and coolant condition during replacement.
• Flush the cooling system if contamination or debris is present.
• Confirm tube orientation and core dimensions against the removed part before installation.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM requirements. The aluminum construction and application-specific sizing support a factory-style replacement for the listed Ford and Mercury vehicles.