Four Seasons 96129 HVAC Heater Core

Four Seasons 96129 Heater Core Overview

The Four Seasons 96129 heater core is an aluminum HVAC heater core built for dependable cabin heat transfer and consistent system performance. With a compact core size of 10 in. wide, 8.94 in. high, and 1.875 in. deep, it is sized for applications that require a direct-fit heater core replacement. This Four Seasons heater core is a practical choice for drivers searching for a heater core for Honda Civic or Toyota Corolla heating system repair, depending on vehicle application.

Key Features

• Aluminum heater core construction for efficient heat exchange
• Core dimensions: 10 in. width, 8.94 in. height, 1.875 in. depth
• Tube connections: 0.625 in. (15.88 mm) inlet and outlet
• HVAC heater core replacement for cabin heat restoration
• Four Seasons part number 96129 for catalog and cross-reference lookup

Product Details

Four Seasons Heater Core 96129 is part of the brand’s heater core line and reflects the company’s long history in mobile air conditioning and HVAC components. The aluminum core design supports heat transfer through the vehicle’s heater system, helping restore warm air delivery through the dash vents when the original core is restricted, leaking, or no longer transferring heat effectively. This part cross-references Gates 6820 for the same application.

Common Problems This Part Can Address

• Weak or uneven heat from the HVAC system
• Coolant odor inside the cabin from a leaking heater core
• Fogging or film on the windshield caused by heater core seepage
• Restricted coolant flow through the heater circuit
• Loss of cabin comfort during cold-weather driving

Installation Notes and Tips

Before installation, verify the heater core dimensions and tube size against the original unit to confirm proper fitment. Inspect heater hoses, clamps, and coolant condition during service, since contamination or hose wear can affect the new core. After installation, refill and bleed the cooling system carefully to remove trapped air and confirm steady heater performance. For vehicle-specific searches, this part is commonly researched as a heater core replacement for Honda Civic and Toyota Corolla HVAC repair, and the Four Seasons 96129 part number should be matched to the exact application before purchase.

Quality Assurance

Four Seasons states that its products are engineered and tested for years of trouble-free operation. Backed by more than 50 years of mobile A/C experience, the brand positions this heater core as a repair-focused replacement built to support reliable HVAC service.