Four Seasons 90778 HVAC Heater Core

Reliable Heater Core Replacement for Buick, Cadillac, and Chevrolet

The Four Seasons Heater Core 90778 is designed to restore efficient heating performance in select Buick, Cadillac, and Chevrolet vehicles. Engineered with durable aluminum construction, this heater core ensures consistent heat transfer and long-lasting operation for models like the Caprice, Century, Fleetwood, and Impala.

• Core dimensions: 8-1/4" length, 6-1/2" width, 1-3/8" thickness
• Constructed from corrosion-resistant aluminum material
• Compatible with Buick Caprice, Cadillac Fleetwood, Chevrolet Impala, Roadmaster, and more
• Meets or exceeds OEM specifications for reliable fit and function
• Includes dual tubes sized 0.625" and 0.750" for efficient coolant flow

Four Seasons Heater Core Product Line Overview

The Four Seasons Heater Core line focuses on delivering quality HVAC components that meet or exceed original equipment standards. The 90778 heater core is part of this line, offering precise fitment and durable aluminum construction to maintain optimal heating system performance in various GM vehicles. This product line emphasizes reliable heat exchange and corrosion resistance to support vehicle comfort and HVAC system longevity.

Detailed Product Description and Specifications

This HVAC heater core features an aluminum core measuring 8.25 inches in height, 6.5 inches in width, and 1.375 inches in depth. The aluminum material provides effective heat transfer while resisting corrosion, which is critical for maintaining heater core integrity over time. The heater core includes two tubes with diameters of 0.625 inches (15.875 mm) and 0.75 inches (19.05 mm), designed for proper coolant circulation. The pipe positioning is fixed, ensuring compatibility with the specified vehicle models without the need for adjustment.

Common Applications and Problem Resolution

• Restores heating function in Buick Caprice and Century models
• Replaces leaking or clogged heater cores in Cadillac Fleetwood and Roadmaster
• Solves insufficient cabin heat issues in Chevrolet Impala and Commercial Chassis vehicles
• Addresses coolant leaks inside the passenger compartment
• Eliminates heater core corrosion and blockage problems

Installation Notes and Tips

When installing the Four Seasons Heater Core 90778, ensure the cooling system is properly drained before removal. Verify the heater core dimensions and tube sizes match the vehicle’s specifications. Since the pipe positioning is not adjustable, confirm alignment with existing HVAC connections. It is recommended to flush the cooling system to remove debris before installing the new heater core to prevent premature clogging.

Quality Assurance and Warranty Information

The Four Seasons Heater Core 90778 meets or exceeds OEM standards, providing reliable performance and durability. Manufactured with corrosion-resistant aluminum, this heater core is built to withstand typical HVAC system conditions. While specific warranty details are not provided here, Four Seasons products generally come with a limited warranty covering defects in materials and workmanship.