Four Seasons 91499 HVAC Heater Core

Four Seasons 91499 Heater Core for Pontiac Fiero

The Four Seasons 91499 heater core is a copper/brass HVAC replacement built for heat transfer and OE-style fitment. It is compatible with 1984-1988 Pontiac Fiero models without air conditioning and matches the application requirements for this vehicle platform.

Key Features

• Brand: Four Seasons Heater Core
• Part number: 91499
• Copper core material for efficient thermal transfer
• Copper/brass heater core construction
• Core dimensions: 6-1/4 in. height, 6-1/4 in. width, 2 in. depth
• Tube sizes: 0.625 in. and 0.750 in.
• Meets or exceeds OEM requirements
• Direct-fit style for the specified Pontiac Fiero application

Product Details

This Four Seasons heater core is built around a copper core material and a copper/brass heater core design, which supports consistent coolant-to-air heat exchange inside the HVAC system. The 6-1/4 x 6-1/4 x 2 inch core size and fixed pipe positioning are important details for matching the original heater box layout in the Pontiac Fiero. Four Seasons 91499 is listed for 1984-1988 Pontiac Fiero models without air conditioning, making it a focused replacement for the correct HVAC configuration.

This part cross-references Dorman - HELP 94499 and CSF 2468 for the same application.

What It Helps Fix

• Weak or inconsistent cabin heat
• Coolant odor inside the passenger compartment
• Leaking heater core symptoms
• Restricted heat output from a clogged core
• HVAC performance loss in a Pontiac Fiero without air conditioning

Installation Notes and Tips

Verify the vehicle is a 1984-1988 Pontiac Fiero without air conditioning before ordering. Confirm the heater hose tube sizes and core dimensions against the original unit, since this application uses fixed pipe positioning. During installation, inspect heater hoses, clamps, and the HVAC case for wear or residue that could indicate a related leak or blockage.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM requirements. The 91499 part number is also referenced across multiple aftermarket catalogs, which supports application consistency for the Pontiac Fiero heater core replacement.