Four Seasons 96123 HVAC Heater Core

Four Seasons 96123 Heater Core Overview

Four Seasons 96123 is an aluminum HVAC heater core built for dependable cabin heat and consistent coolant-to-air transfer. It is part of the Four Seasons Heater Core line, a product family focused on replacement heater cores for automotive HVAC repair.

With a 10 in. width, 8.625 in. height, and 2.5 in. core depth, this aluminum heater core is sized for direct-fit service where the original unit matches these dimensions. The 0.625 in. inlet and outlet tube sizes support common heater hose connections used in passenger vehicle heating systems.

Key Features

• Part number: 96123
• Aluminum heater core construction
• Core dimensions: 10 in. wide x 8.625 in. high x 2.5 in. deep
• Tube size: 0.625 in. / 15.88 mm
• Built for HVAC heater core replacement service
• Four Seasons Heater Core product line

Product Details

Four Seasons 96123 is an aluminum heater core engineered and tested for long-term operation in automotive HVAC systems. As a replacement heater core, it restores heat exchange performance inside the heater box and supports proper cabin heating when the original core is restricted, leaking, or no longer transferring heat efficiently. This part cross-references Gates 6821 for the same application.

For buyers searching for a heater core for Honda Civic or other vehicle-specific HVAC repair, verify the original core dimensions and tube size before ordering. The Four Seasons 96123 heater core is also referenced in aftermarket catalogs under part number 96123 for streamlined lookup.

Common Problems This Part Can Address

• Weak or uneven cabin heat
• Coolant odor inside the vehicle
• Coolant leakage from the heater core area
• Restricted heat output caused by internal blockage
• HVAC performance loss from a damaged aluminum heater core

Installation Notes and Tips

Confirm core width, height, depth, and tube diameter against the removed unit before installation. Inspect heater hoses, clamps, and the HVAC case for wear or contamination while the system is open. Proper coolant refill and air bleeding are important after heater core replacement to restore normal heater operation.

Quality Assurance

Four Seasons states that its products are engineered and tested for trouble-free operation, drawing on more than 50 years of mobile A/C experience. The 96123 heater core is built to support reliable HVAC service and consistent replacement quality.