Four Seasons 98478 HVAC Heater Core

Four Seasons 98478 Heater Core for Jeep CJ5

Restore cabin heat in your classic Jeep with the Four Seasons 98478 heater core. This aluminum heater core is built to meet or exceed OEM requirements and is sized for direct replacement in 1965-1971 Jeep CJ5 heater core applications.

Four Seasons Heater Core line parts are focused on dependable HVAC replacement performance, with dimensions and tube sizing that support accurate fitment in the original heater box. The 98478 heater core uses an aluminum core construction for efficient heat transfer in a compact OE-style layout.

Key Features

• Part number: 98478
• Brand line: Four Seasons Heater Core
• Aluminum heater core construction
• Meets or exceeds OEM specifications
• Core dimensions: 7 in. height, 7-3/8 in. width, 2 in. depth
• Tube size: 0.625 in. / 15.875 mm on both connections
• Fixed pipe positioning

Product Details

The Four Seasons 98478 heater core is an aluminum HVAC heater core designed for Jeep CJ5 heating system service. Its compact 7 x 7-3/8 x 2 inch core size and 0.625 inch tube connections support OE-style replacement in the factory heater assembly. If you are replacing a leaking or restricted heater core in a 1965-1971 Jeep CJ5, this part provides the correct form factor for the application.

This part cross-references Carlson H2327 for the same application.

Common Problems This Part Can Address

• Loss of cabin heat in cold weather
• Coolant seepage from a corroded heater core
• Restricted coolant flow through the HVAC heater circuit
• Fogging or dampness caused by an internal heater core leak
• Reduced defrost performance in the Jeep CJ5 heating system

Installation Notes and Tips

Verify the heater box dimensions, tube orientation, and hose routing before installation. Compare the original core to the Four Seasons 98478 to confirm the 7 in. x 7-3/8 in. x 2 in. size and fixed pipe position match your Jeep CJ5 HVAC setup. Flush the cooling system and inspect hoses, clamps, and the heater control valve before returning the vehicle to service.

Quality Assurance

The Four Seasons 98478 heater core is listed as meeting or exceeding OEM specifications, supporting a direct-replacement approach for 1965-1971 Jeep CJ5 heater core service.