Four Seasons 98477 HVAC Heater Core

Four Seasons 98477 Heater Core Overview

The Four Seasons 98477 heater core is an aluminum HVAC heater core built for dependable cabin heat and efficient coolant-to-air transfer. With a compact 7-1/8 in. height, 6 in. width, and 1-7/8 in. depth, it is sized for applications that require a precise fit inside the heater case.

Compatible With select GM vehicle heater core applications, this Four Seasons heater core is a direct replacement option for restoring heat output and defrost performance. The Four Seasons Heater Core line focuses on OE-style replacement parts, and part number 98477 meets or exceeds OEM requirements.

Key Features

• Aluminum heater core construction for efficient heat transfer
• Dimensions: 7-1/8 in. length, 6 in. width, 1-7/8 in. thickness
• Tube sizes: 0.625 in. and 0.750 in.
• Meets or exceeds OEM specifications
• Four Seasons part number 98477 for catalog and fitment lookup
• Direct-fit style heater core for HVAC repair work

Detailed Product Description

Four Seasons 98477 is an aluminum heater core designed for HVAC systems that need a compact, OE-style replacement. The core measures 7.125 in. high, 6.000 in. wide, and 1.875 in. deep, with fixed pipe positioning and tube diameters of 0.625 in. and 0.750 in. These dimensions help ensure proper placement inside the heater case and consistent coolant flow through the core.

This heater core is a practical choice for GM heater core replacement jobs where the original unit has leaked, restricted flow, or lost heating efficiency. If you are searching for a Four Seasons heater core 98477 for GM applications, this part provides a straightforward replacement path for restoring interior heat and windshield defrost performance.

This part cross-references APDI 9010274 for the same application.

What This Heater Core Helps Address

• Weak or uneven cabin heat
• Coolant odor inside the vehicle
• Heater core leakage
• Poor windshield defrost performance
• Restricted coolant flow through the HVAC heater circuit

Installation Notes and Tips

Verify heater core dimensions, tube sizes, and pipe orientation against the removed unit before installation. Because fitment varies by vehicle and HVAC case design, confirm application details for your GM model before ordering. Inspect hoses, clamps, and coolant condition during service to help prevent repeat HVAC issues.

Quality Assurance

Four Seasons 98477 is built as an OE-style replacement heater core and is listed as meeting or exceeding OEM requirements. The Four Seasons Heater Core product line is intended for professional-grade HVAC repair and replacement work.