Four Seasons 90901 HVAC Heater Core - Front

Reliable Heater Core Replacement for Ford, Lincoln, and Mercury Vehicles

The Four Seasons Heater Core part number 90901 is designed to restore efficient heating performance in select Ford, Lincoln, and Mercury models. Engineered with durable aluminum construction, this heater core ensures consistent heat transfer and long-lasting operation for your vehicle's HVAC system.

• Core dimensions: 9-5/8 inches length, 6-1/8 inches width, 1-7/8 inches thickness
• Constructed from corrosion-resistant aluminum material
• Core depth of 1.875 inches and height of 9.625 inches for precise fit
• Tube diameter: 0.625 inches (15.875 mm) for both inlet and outlet
• Meets or exceeds OEM specifications for reliable performance

Four Seasons Heater Core Product Line Overview

The Four Seasons Heater Core line focuses on delivering quality HVAC heater cores that meet or exceed original equipment manufacturer standards. This aluminum heater core is part of that line, providing a balance of durability and efficient heat exchange. The design ensures compatibility with specific Ford, Lincoln, and Mercury models, maintaining factory-level heating system functionality.

Detailed Product Description and Specifications

This HVAC heater core (part number 90901) features an aluminum core that offers excellent thermal conductivity and resistance to corrosion. The core measures 9.625 inches in height, 6.125 inches in width, and 1.875 inches in depth, making it suitable for direct replacement in compatible vehicles. Both inlet and outlet tubes have a diameter of 0.625 inches (15.875 mm), ensuring proper coolant flow. The heater core does not include adjustable pipe positioning, so it is designed for exact OEM fitment. This part is compatible with Ford Expedition, F-150, F-250, F-350, Lincoln Mark LT, Mercury Mountaineer, and Lincoln Navigator models.

Common Applications and Issues Addressed

• Restores heating system performance in Ford F-150 and F-250 trucks
• Eliminates coolant leaks and prevents interior fogging in Lincoln Navigator
• Resolves insufficient cabin heat in Mercury Mountaineer and Ford Expedition
• Replaces clogged or corroded heater cores causing reduced heat output
• Prevents engine overheating related to heater core failure

Installation Notes and Tips

When installing the Four Seasons Heater Core 90901, ensure the vehicle is compatible with the specified fitment list. Properly drain the cooling system before removal to avoid spills. Since this heater core does not have adjustable pipe positioning, verify alignment with existing hoses and mounting points. It is recommended to inspect and replace any worn hoses or clamps during installation to maintain system integrity.

Quality Assurance and Warranty Information

The Four Seasons Heater Core 90901 meets or exceeds OEM standards, providing reliable performance and durability. Manufactured with corrosion-resistant aluminum, this heater core is built to withstand typical operating conditions. Please refer to Four Seasons' warranty policy for specific coverage details.