Four Seasons 90624 HVAC Heater Core

Four Seasons 90624 Heater Core

The Four Seasons 90624 heater core is an aluminum HVAC heater core built for 1979 Ford LTD, 1979 Ford Thunderbird, and 1979 Mercury Cougar models with air conditioning. With a compact core size and aluminum construction, it supports efficient cabin heat transfer in the factory heater box.

Key Features

• Aluminum heater core construction
• Core dimensions: 1.625 in. depth, 7 in. height, 5.875 in. width
• Tube sizes: 0.625 in. and 0.75 in.
• Direct-fit HVAC heater core for select 1979 Ford and Mercury applications
• Four Seasons part number 90624 for catalog matching and replacement lookup

Product Details

Four Seasons Heater Core 90624 is part of the brand’s heater core line and is engineered and tested for dependable HVAC service. The aluminum heater core design helps restore heat exchange performance in vehicles equipped with AC, including 1979 Ford LTD, 1979 Ford Thunderbird, and 1979 Mercury Cougar. This part cross-references APDI 9010127 for the same application.

Use this heater core when replacing a leaking, restricted, or inefficient HVAC core in the factory heating system. The compact aluminum core and tube layout are sized for the listed applications, making it a focused replacement for restoration and repair work.

Common Problems It Can Address

• Loss of cabin heat from a leaking heater core
• Sweet coolant odor inside the vehicle
• Fogging or film on the windshield caused by coolant vapor
• Reduced heater output in cold weather
• Coolant seepage into the HVAC case

Installation Notes and Tips

Verify the vehicle is a 1979 Ford LTD, 1979 Ford Thunderbird, or 1979 Mercury Cougar with AC before ordering. Compare the core depth, height, width, and tube sizes to the original unit before installation. Inspect hoses, clamps, and the HVAC case for wear or contamination while the system is open, and flush the cooling system if coolant contamination is present.

Quality Assurance

Four Seasons backs this heater core with more than 50 years of mobile A/C experience and states that its products are engineered and tested for years of trouble-free operation. The 90624 is built for replacement accuracy and consistent HVAC performance in the listed applications.