Four Seasons 92128 HVAC Heater Core

Four Seasons 92128 Heater Core for Mazda Miata

Restore cabin heat with the Four Seasons 92128 heater core, an aluminum HVAC heater core built for direct replacement service. It is engineered to meet or exceed OEM requirements and is listed for 1999-2005 Mazda Miata heater core applications.

Key Features

• Four Seasons heater core, part number 92128
• Aluminum core construction for efficient heat transfer
• Meets or exceeds OEM specifications
• Core dimensions: 7 in. height, 5-3/4 in. width, 1 in. depth
• Tube size: 0.625 in. / 15.875 mm on both connections
• Direct-fit HVAC heater core for Mazda Miata heating system service

Product Details

The Four Seasons Heater Core line focuses on replacement HVAC components for heating system repair. This aluminum heater core is sized for the 1999-2005 Mazda Miata and uses a compact core layout with 7.000 in. height, 5.750 in. width, and 1.000 in. depth. The aluminum core material supports heat exchange in the vehicle’s heater box, while the fixed pipe positioning helps maintain a straightforward replacement path. If you are searching for a Mazda Miata heater core replacement or Four Seasons 92128 heater core, this part matches the listed application.

This part cross-references Dayco 91128 for the same application.

Common Repair Uses

• Loss of cabin heat in a 1999-2005 Mazda Miata
• Coolant odor or moisture inside the HVAC case
• Restricted heater performance from a leaking or clogged core
• Temperature inconsistency from a failing heater core
• HVAC service after coolant contamination in the heater box

Installation Notes

Verify the core dimensions and tube sizes against the original unit before installation. Inspect heater hoses, clamps, and the HVAC case for wear or contamination during replacement. Proper coolant refill and system bleeding are important after heater core service to help prevent air pockets and restore normal heater operation.

Quality Assurance

This Four Seasons heater core is listed as meeting or exceeding OEM requirements for the specified Mazda Miata application. Confirm fitment by year, make, model, and heater core configuration before ordering.