Four Seasons 90749 HVAC Heater Core

Four Seasons 90749 Heater Core Overview

The Four Seasons 90749 heater core is an aluminum HVAC heater core built for direct replacement service in select Acura and Honda applications. It is engineered to meet or exceed OEM requirements and uses a compact aluminum core design for efficient cabin heat transfer.

Compatible with 1990-1993 Acura Integra, 1988-1991 Honda Civic, and 1988-1991 Honda CRX, this heater core is a fitment-based replacement for vehicles with the listed aluminum design. The Four Seasons heater core line focuses on OE-style service parts for heating system repair, and part number 90749 is listed for the same application as several cross-reference numbers.

Key Features

• Aluminum heater core construction
• Meets or exceeds OEM specifications
• Core dimensions: 7-7/8 in. length, 5 in. width, 2 in. depth
• Tube size: 0.625 in. / 15.875 mm on both connections
• Direct-fit HVAC heater core for listed Acura and Honda models
• Four Seasons part number 90749

Detailed Product Description

Four Seasons 90749 is an aluminum HVAC heater core designed for vehicles that use the specified compact core layout and 0.625-inch tube connections. The aluminum core material supports efficient heat exchange inside the HVAC system, helping restore proper cabin heat output when the original heater core is restricted, leaking, or no longer transferring heat effectively. This part is listed for 1990-1993 Acura Integra, 1988-1991 Honda Civic, and 1988-1991 Honda CRX, making it a focused replacement for common import heating system repairs.

This heater core cross-references APDI 9010266 and Remy 94749 for the same application. If you are sourcing a Four Seasons 90749 heater core for Acura Integra or Honda Civic heater core replacement work, verify the core dimensions and tube orientation against the removed unit before installation.

What This Heater Core Helps Address

• Weak or uneven cabin heat
• Coolant odor inside the passenger compartment
• Moisture or fogging caused by heater core leakage
• Restricted coolant flow through the HVAC heater circuit
• Replacement of a corroded or damaged aluminum heater core

Installation Notes and Tips

Confirm vehicle fitment by year, make, and model before ordering. Compare the existing heater core’s dimensions, tube diameter, and pipe layout to Four Seasons 90749, since this unit uses fixed pipe positioning and does not feature adjustable pipe positioning. Inspect the HVAC housing, coolant hoses, and related seals during service so the replacement can be installed with the system fully cleaned and reassembled correctly.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM requirements. The aluminum construction and OE-style dimensions support service replacement on the specified Acura and Honda applications.