Four Seasons 96571 HVAC Heater Core

Heater Core for Ford and Mercury Applications

Four Seasons 96571 is an OEM-specific aluminum heater core built for direct replacement in select Ford and Mercury vehicles. It measures 7-3/4 inches long, 6 inches wide, and 1-7/8 inches thick, with 0.625-inch tubes for a precise HVAC fit.

As part of the Four Seasons Heater Core line, this unit is made to meet or exceed OEM requirements and is focused on restoring proper cabin heat in classic Ford Bronco, F-Series trucks, Mustang, Thunderbird, and select Mercury models.

Key Features

• Four Seasons part number 96571
• Aluminum heater core construction
• OEM specific fit for direct application matching
• Core dimensions: 7.750 in. height, 6.000 in. width, 1.875 in. depth
• 0.625 in. inlet and outlet tube size
• Meets or exceeds OEM specifications
• Gasket or seal not included

Detailed Product Description

This Four Seasons heater core is engineered for HVAC systems that require an aluminum core with exact dimensional matching. The compact core size and tube layout support proper coolant flow through the heater housing, helping maintain consistent heat output in vehicles such as the 1971-1973 Ford Mustang, 1975-1979 Ford F-150, and 1971-1978 Mercury Cougar. Four Seasons 96571 is also cross-referenced with Spectra Premium 94571 for the same application.

The Four Seasons Heater Core product line focuses on replacement HVAC components that align with original equipment dimensions and performance requirements. For buyers searching for a heater core for 1978-1979 Ford Bronco without air conditioning, or a heater core for 1975-1979 Ford F-250 with High Output Heater and without AC, this part number is a direct-fit option to verify against the original unit.

What This Heater Core Helps Address

• Weak or no cabin heat from a leaking or restricted heater core
• Coolant odor inside the vehicle caused by heater core seepage
• Fogging or film on the windshield from HVAC coolant leakage
• Uneven heater performance in older Ford and Mercury HVAC systems
• Replacement needs after corrosion or internal blockage

Installation Notes and Tips

Verify the original heater core dimensions, tube size, and housing layout before installation. This part is OEM specific and does not use adjustable pipe positioning. Gasket or seal is not included, so reuse or replacement of related sealing components should be confirmed during service. For fitment, confirm the vehicle and HVAC configuration, including whether the application is for models without air conditioning or with High Output Heater equipment.

• Fits 1978-1979 Ford Bronco, N/A, compatible with models that do not have air conditioning
• Fits 1975-1979 Ford F-100, N/A, w/ High Output Heater; w/o AC
• Fits 1975-1979 Ford F-150, N/A, w/ High Output Heater; w/o AC
• Fits 1975-1979 Ford F-250, N/A, w/ High Output Heater; w/o AC
• Fits 1975-1979 Ford F-350, N/A, w/ High Output Heater; w/o AC
• Fits 1977-1978 Ford Thunderbird, N/A, compatible with models that do not have air conditioning
• Fits 1971-1978 Mercury Cougar, N/A, compatible with models that do not have air conditioning
• Fits 1975-1978 Mercury Monarch, N/A, compatible with models that do not have air conditioning
• Fits 1968-1976 Mercury Montego, N/A, compatible with models that do not have air conditioning
• Fits 1973-1974 Ford F-100, N/A, w/ High Output Heater
• Fits 1973-1974 Ford F-250, N/A, w/ High Output Heater
• Fits 1973-1974 Ford F-350, N/A, w/ High Output Heater
• Fits 1971-1973 Ford Mustang, N/A, compatible with models that do not have air conditioning
• Fits 1967 Mercury Villager, N/A, w/o AC

Quality Assurance

Four Seasons 96571 is built to meet or exceed OEM specifications for the listed applications. Confirm the original heater core dimensions and vehicle HVAC configuration during service to ensure proper replacement selection.