Four Seasons 92390 HVAC Heater Core

Four Seasons 92390 Heater Core Overview

Four Seasons 92390 is an aluminum HVAC heater core built for direct replacement service in select Mazda applications. It is engineered to meet or exceed OEM requirements and is sized for a precise fit in the heater core housing.

Compatible with 2006-2009 Mazda 3, Mazda 3 Sport, and Mazda 5 applications listed below, this heater core supports dependable cabin heat performance when the original unit is leaking, restricted, or no longer transferring heat efficiently. Four Seasons heater core 92390 is a practical OE-style replacement for Mazda 3 and Mazda 5 heating system repairs.

Key Features

• Aluminum heater core construction for HVAC service
• Core dimensions: 7-3/4 in. length, 7-1/4 in. width, 1-1/4 in. thickness
• Tube size: 0.625 in. / 15.875 mm on both connections
• Meets or exceeds OEM specifications
• Four Seasons Heater Core line for HVAC replacement applications
• Part number 92390 for accurate ordering and fitment lookup

Product Details

Four Seasons 92390 is an aluminum heater core designed for the HVAC system and built around the listed core dimensions and tube sizes. The compact core height, width, and depth support proper installation in the heater case, while the aluminum style helps maintain efficient heat transfer for passenger compartment heating. This part number 92390 is cross-referenced by Edelmann 92390 for the same application.

Fits 2008-2009 Mazda 3, N/A, w/ cold spec; Heater Core. Fits 2009 Mazda 3 Sport, N/A, w/ cold spec; Heater Core. Fits 2007-2008 Mazda 5, N/A, Heater Core. Fits 2007 Mazda 3, N/A, w/ Cold Spec; From 6/22/07; Heater Core. Fits 2006 Mazda 5, N/A, From 11/05; Heater Core.

Common Issues This Part Addresses

• Loss of cabin heat from a leaking or clogged heater core
• Coolant odor inside the vehicle from heater core seepage
• Fogging or film on the windshield caused by HVAC coolant leakage
• Uneven or weak heat output from the heater system
• Cooling system contamination related to heater core failure

Installation Notes and Tips

Verify the vehicle’s build date and cold-spec configuration before ordering, especially on 2007 Mazda 3 and 2006 Mazda 5 applications. Confirm the inlet and outlet tube orientation against the original part and inspect the HVAC case, hoses, and coolant condition during replacement. Proper coolant refill and system bleeding are important after heater core service.

Quality Assurance

Four Seasons 92390 is listed as meeting or exceeding OEM requirements for the specified Mazda heater core applications. The Four Seasons Heater Core line is intended for direct-fit HVAC replacement service, with dimensions and tube sizing provided for application matching.