Four Seasons 98713 HVAC Heater Core

Four Seasons 98713 Heater Core

The Four Seasons Heater Core 98713 is an aluminum HVAC heater core built for direct-fit replacement in select Toyota trucks. It is sized to match the original core dimensions and meets or exceeds OEM requirements for the listed applications.

Key Features

• Aluminum heater core construction for efficient heat transfer
• Core dimensions: 8-5/8 in. length, 5-5/8 in. width, 1-1/4 in. thickness
• Core height: 8.625 in.; core width: 5.625 in.; core depth: 1.250 in.
• Tube sizes: 0.625 in. and 0.750 in.
• Meets or exceeds OEM specifications
• Four Seasons Heater Core line for HVAC replacement service

Product Details

Built as an aluminum heater core, Four Seasons part number 98713 is made for vehicles that need a precise HVAC heat exchanger replacement. The compact core dimensions and fixed pipe positioning support proper fitment in the factory heater box. This part cross-references UAC HT398282C for the same application.

Compatible With Toyota T100 and Toyota Pickup heater core applications, this replacement is listed for 1993-1998 Toyota T100 without Cold Spec and 1989-1995 Toyota Pickup with standard heater equipment. If you are searching for a heater core for 1993-1998 Toyota T100 or a heater core for 1989-1995 Toyota Pickup, Four Seasons 98713 is the direct-fit option for the specified HVAC setup.

Common Problems This Part Can Address

• Weak or uneven cabin heat from a restricted heater core
• Coolant seepage inside the HVAC case from a leaking core
• Reduced defrost performance caused by poor heater output
• Temperature inconsistency in Toyota T100 or Toyota Pickup heating systems
• Corrosion-related heater core failure in aging HVAC components

Installation Notes and Tips

Verify the vehicle’s heater configuration before ordering, since fitment differs between Toyota Pickup standard heater applications and Toyota T100 models without Cold Spec. Confirm the tube sizes and core dimensions against the original part before installation. Proper cooling system service, including coolant inspection and system bleed procedures, helps protect the new heater core after replacement.

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 reliable HVAC service in the listed Toyota models.