Four Seasons 96139 HVAC Heater Core

Four Seasons 96139 Heater Core

The Four Seasons 96139 heater core is an aluminum HVAC heater core built for dependable cabin heat and stable coolant flow through the heater system. With a compact 8 in. width, 7.875 in. height, and 2.5 in. depth, it is sized for applications that require a direct-fit heater core replacement.

Four Seasons heater core products are backed by more than 50 years of mobile A/C experience and are engineered and tested for long service life. If you are replacing a leaking or restricted heater core in a Honda Civic or similar vehicle application, this part number 96139 is a practical OE-style service part.

Key Features

• Aluminum heater core construction for HVAC service applications
• Core dimensions: 8 in. wide, 7.875 in. high, 2.5 in. deep
• Tube size: 0.625 in. / 15.88 mm on both connections
• Designed as a heater core / aluminum replacement component
• Cross-references Gates 6974 and Spectra Premium 99443 for the same application
• Four Seasons part number 96139 for catalog and fitment lookup

Product Details

Four Seasons 96139 is an aluminum HVAC heater core used in the vehicle heating circuit to transfer engine coolant heat into the cabin air stream. The aluminum core design supports efficient heat exchange while keeping the unit compact for tight HVAC cases. For buyers searching for a heater core replacement for Honda Civic applications, this part number 96139 provides a straightforward reference point when matching dimensions and connection sizes.

The Four Seasons heater core line focuses on engineered replacement components tested for consistent operation. This makes the 96139 a solid choice when the original heater core shows signs of internal leakage, reduced heat output, or flow restriction.

Common Problems This Part Can Address

• Coolant odor or dampness inside the cabin from a leaking heater core
• Weak or uneven heat output from the HVAC system
• Restricted coolant flow through the heater circuit
• Fogging or film on the windshield caused by heater core seepage
• Need for a direct replacement heater core during HVAC repair

Installation Notes and Tips

Before installation, verify core dimensions, tube diameter, and HVAC case layout against the removed unit. Flush the cooling system and inspect hoses, clamps, and seals so debris or contamination does not shorten the life of the replacement heater core. On Honda Civic heater core replacement jobs, confirm the heater box is clean and free of residue before reassembly.

Because heater core access often requires dashboard or HVAC case disassembly, compare the old and new part carefully before final installation. The 96139 should be matched to the vehicle by dimensions and application data, not by appearance alone.

Quality Assurance

Four Seasons states that its products are engineered and tested for years of trouble-free operation. Backed by over 50 years of mobile A/C experience, the brand positions this heater core line as a reliable replacement choice for HVAC service work.