Four Seasons 91473 HVAC Heater Core

Four Seasons 91473 Heater Core

The Four Seasons 91473 heater core is an aluminum HVAC replacement built for heat transfer and OE-style fitment. It is listed for 1983-1987 Mazda 626 heater core applications and meets or exceeds OEM requirements.

Key Features

• Aluminum heater core construction for efficient thermal performance
• Core dimensions: 6-1/8 in. height, 6-1/2 in. width, 1-3/4 in. depth
• Tube size: 0.750 in. / 19.050 mm on both connections
• Meets or exceeds OEM specifications
• Four Seasons Heater Core line, part number 91473

Product Details

Four Seasons 91473 is an aluminum heater core designed for HVAC systems that need reliable cabin heat output and proper coolant flow through the heater circuit. The compact core size and fixed pipe positioning support direct replacement use in the specified Mazda 626 heater core application. This part cross-references Spectra Premium 94473 for the same application.

Compatible With 1983-1987 Mazda 626 heater core applications, this Four Seasons heater core is also identified by part number 91473 and interchange number 98473. The aluminum core material and OE-level dimensional profile make it a practical choice when replacing a leaking, restricted, or heat-reduced heater core in the vehicle’s HVAC system.

Common Issues This Part Can Address

• Weak or inconsistent cabin heat
• Coolant odor inside the passenger compartment
• Heater core leakage at the HVAC unit
• Restricted coolant flow through the heater circuit
• Temperature imbalance caused by a failing core

Installation Notes and Tips

Verify the core dimensions, tube size, and fixed pipe position before installation. Drain the cooling system, inspect heater hoses and clamps, and flush the system if contamination or debris is present. Confirm fitment against the vehicle’s HVAC layout for 1983-1987 Mazda 626 models before reassembly.

Quality Assurance

Four Seasons 91473 is listed as meeting or exceeding OEM requirements, supporting a direct-replacement approach for the specified application. The Four Seasons Heater Core line is built for consistent HVAC service in compatible Mazda 626 vehicles.