Four Seasons 96103 HVAC Heater Core

Four Seasons 96103 Heater Core Overview

The Four Seasons 96103 heater core is an aluminum HVAC heater core built for dependable cabin heat transfer and OE-style replacement needs. With a 14-1/2 in. core height, 7-1/4 in. core width, and 1-1/4 in. core depth, it is sized for applications that require a compact aluminum heater core with fixed pipe positioning.

Compatible With select vehicle heating systems, this Four Seasons Heater Core line part is a practical choice for restoring interior heat performance in vehicles such as Honda Civic and Toyota Corolla applications where the correct heater core dimensions and tube layout matter.

Key Features

• Part number 96103 from Four Seasons Heater Core
• Aluminum heater core construction for efficient heat transfer
• Core dimensions: 14-1/2 in. height, 7-1/4 in. width, 1-1/4 in. depth
• Tube size: 0.8125 in. (20.6375 mm) on both connections
• Meets or exceeds OEM requirements
• Fixed pipe positioning; adjustable pipe positioning is not included
• OE-style replacement for HVAC heater core service

Product Details

The Four Seasons 96103 heater core is part of the brand’s Heater Core product line and is built as an aluminum heater core / aluminum HVAC heater core replacement. Its dimensions and tube sizing are important for proper case fitment and coolant flow through the heater circuit. For buyers searching for a heater core for Honda Civic or heater core for Toyota Corolla, confirming the core height, width, depth, and tube diameter is essential before ordering.

This part cross-references Spectra Premium 99430 and UAC HT400035C for the same application.

Common Problems This Part Can Help Address

• Weak or inconsistent cabin heat output
• Coolant seepage from a leaking heater core
• Restricted heat transfer caused by internal blockage
• Fogging or sweet odor inside the cabin from heater core failure
• HVAC performance loss tied to a damaged core assembly

Installation Notes and Tips

Verify heater core dimensions, tube diameter, and pipe orientation against the original unit before installation. Because this part uses fixed pipe positioning, compare the inlet and outlet locations carefully to the vehicle’s HVAC case and coolant lines. Flush the cooling system and inspect hoses, clamps, and the heater control valve, if equipped, before installing the replacement heater core.

For fitment-based searches, confirm the exact application for your Honda Civic or Toyota Corolla by matching the vehicle year, HVAC case layout, and connection style to the original part.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM requirements, making it a direct replacement option for service work that calls for OE-level dimensions and construction.