Four Seasons 90498 HVAC Heater Core

Four Seasons 90498 Heater Core Overview

The Four Seasons 90498 heater core is an aluminum HVAC heater core built for direct-fit service in select Pontiac Fiero applications. It is engineered and tested for dependable operation, with dimensions that match the listed vehicle fitment for a proper heater system repair.

Compatible with 1984 Pontiac Fiero with AC and 1985-1988 Pontiac Fiero, this heater core supports cabin heat restoration when the original core is leaking, restricted, or no longer transferring heat effectively. Four Seasons backs this heater core line with more than 50 years of mobile A/C experience.

Key Features

• Part number: 90498
• Aluminum heater core construction
• Core dimensions: 2 in. depth, 5.375 in. height, 6.25 in. width
• Tube sizes: 0.625 in. and 0.750 in.
• Direct-fit HVAC heater core for listed Pontiac Fiero applications
• Four Seasons Heater Core product line

Product Details

The Four Seasons Heater Core line focuses on replacement HVAC components built for consistent thermal transfer and fitment accuracy. This aluminum heater core uses a compact core size and tube configuration suited to the Pontiac Fiero heater system. If you are replacing a leaking or clogged heater core on a Pontiac Fiero, part number 90498 provides a service-ready replacement for the specified model years.

This part cross-references Dorman - HELP 94498 for the same application.

Common Problems This Part Can Address

• Loss of cabin heat
• Coolant odor inside the vehicle
• Moisture or fogging on the windshield from heater core leakage
• Restricted coolant flow through the heater circuit
• Temperature inconsistency from a failing HVAC heater core

Installation Notes and Tips

Verify the vehicle year and AC configuration before ordering. Compare the existing core dimensions and tube sizes to the listed specifications for Four Seasons 90498. During replacement, inspect heater hoses, clamps, and coolant condition so the new heater core can operate within a clean and sealed system.

Quality Assurance

Four Seasons engineers and tests its products for long service life, drawing on more than 50 years of mobile A/C experience. The 90498 heater core is part of that HVAC replacement lineup and is built for dependable repair service in the listed Pontiac Fiero applications.