Four Seasons 98544 HVAC Heater Core

Heater Core for Chevrolet Chevette and Pontiac T1000

Restore cabin heat and coolant-to-air transfer with this Four Seasons Heater Core, part number 98544. Built with an aluminum core and OE-matching dimensions, it is a direct replacement for select Chevrolet Chevette and Pontiac T1000 applications.

Key Features

• Four Seasons Heater Core, part number 98544
• Aluminum heater core construction
• Core dimensions: 5-5/8 in. length, 6 in. width, 1-7/8 in. thickness
• Tube sizes: 0.625 in. and 0.750 in.
• Meets or exceeds OEM requirements
• Compatible with 1976-1987 Chevrolet Chevette, heater core position
• Compatible with 1981-1987 Pontiac T1000, heater core position

Product Details

The Four Seasons Heater Core 98544 is an aluminum heater core engineered for vehicles that need a precise HVAC heat exchanger replacement. Its compact 5-5/8 inch by 6 inch core size and 1-7/8 inch thickness support proper fitment in the heater case, while the tube diameters are sized for the listed applications. This part cross-references Dorman - HELP 90690 for the same application.

For Chevrolet Chevette and Pontiac T1000 owners searching for a heater core replacement, part number 98544 provides the dimensional match needed for HVAC service work. It is listed for 1976-1987 Chevrolet Chevette and 1981-1987 Pontiac T1000 models, making it a focused solution for classic compact-car heating system repair.

Common Issues This Part Can Address

• Loss of cabin heat from a leaking or restricted heater core
• Coolant odor inside the passenger compartment
• Fogging or film on the inside of the windshield caused by heater core seepage
• Uneven or weak heat output from the HVAC system
• Cooling system contamination related to heater core failure

Installation Notes and Tips

Verify core dimensions, tube orientation, and hose connection sizes before installation. Inspect the heater hoses, clamps, and HVAC case for wear or corrosion while the system is open. Proper coolant refill and air bleeding are important after heater core replacement to help the heating system operate correctly.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM specifications. The aluminum construction and application-specific sizing support reliable replacement performance for the listed Chevrolet Chevette and Pontiac T1000 fitments.