Four Seasons 92304 HVAC Heater Core

Four Seasons 92304 Heater Core for Mazda 3

Four Seasons 92304 is an aluminum HVAC heater core built for direct replacement service in select Mazda 3 and Mazda 3 Sport applications. It matches the listed dimensions and meets or exceeds OEM requirements for the specified vehicles.

Key Features

• Aluminum heater core construction for HVAC heat transfer
• Dimensions: 7-9/16 in. length, 6-3/4 in. width, 1-1/4 in. thickness
• Core height: 7.5625 in.; core depth: 1.25 in.; core width: 6.75 in.
• Tube sizes: 0.625 in. and 0.4375 in.
• Meets or exceeds OEM specifications
• Four Seasons Heater Core line, part number 92304

Product Details

This Four Seasons heater core is part of the brand’s Heater Core line and is engineered as an aluminum heater core for the HVAC system. The compact core size and tube dimensions are matched to the listed Mazda fitments, helping maintain proper coolant flow through the heater circuit and consistent cabin heat output. Part number 92304 is also cross-referenced to Dorman - HELP 91304 for the same application.

Compatible With 2010-2013 Mazda 3, heater core; 2012-2013 Mazda 3, heater core without Skyactiv Technology; 2013 Mazda 3, heater core from 12/12 with Skyactiv Technology; 2010-2013 Mazda 3 Sport, heater core; 2012-2013 Mazda 3 Sport, heater core without Skyactiv Technology; and 2013 Mazda 3 Sport, heater core from 12/12 with Skyactiv Technology.

Common Replacement Reasons

• Weak or uneven cabin heat
• Coolant odor inside the vehicle
• Leaking heater core causing interior moisture
• Restricted coolant flow through the HVAC heater circuit
• Heat loss in Mazda 3 or Mazda 3 Sport heating systems

Installation Notes

Verify the vehicle’s build date and Skyactiv Technology status before ordering, since fitment varies by configuration. Confirm the tube sizes and core dimensions against the original unit during replacement. This part is listed for N/A position applications and should be installed according to the vehicle service procedure for the HVAC system.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM requirements for the specified applications. The aluminum construction and application-specific sizing support OE-style replacement service for Mazda 3 and Mazda 3 Sport heating systems.