Four Seasons 98553 HVAC Heater Core - Front

Four Seasons Heater Core 98553

Four Seasons 98553 is an aluminum HVAC heater core built for direct replacement in a wide range of classic Chevrolet and GMC trucks, vans, and SUVs. It measures 7-5/8 in. long, 6-3/8 in. wide, and 1-7/8 in. thick, with 0.625 in. and 0.750 in. tube sizes for the listed applications.

Use this Four Seasons Heater Core when servicing heater performance on vehicles such as Chevrolet Blazer, GMC Jimmy, and Chevrolet/GMC C/K and R/V-series models without air conditioning. Part number 98553 meets or exceeds OEM requirements and is listed with aluminum core construction.

Key Features

• Aluminum heater core construction
• Core dimensions: 7-5/8 in. x 6-3/8 in. x 1-7/8 in.
• Tube sizes: 0.625 in. and 0.750 in.
• Meets or exceeds OEM specifications
• Direct-fit style for listed HVAC heater core applications
• Four Seasons Heater Core line replacement part number 98553

Detailed Description

The Four Seasons Heater Core 98553 is an OE-style HVAC heater core for older Chevrolet and GMC platforms, including P-series, C/K-series, R/V-series, Blazer, and Jimmy applications. Its aluminum core material supports efficient heat transfer for cabin heating systems, and the listed dimensions help confirm fitment before installation. This part cross-references Gates 6829 for the same application.

Fitment coverage includes 1973-1992 Chevrolet and GMC models, with many applications noted for vehicles without air conditioning. For search relevance, this part is commonly selected for Chevrolet Blazer heater core replacement, GMC Jimmy heater core replacement, and Chevrolet/GMC truck heater core service.

What It Helps Fix

• Weak or inconsistent cabin heat
• Coolant seepage from a leaking heater core
• Restricted coolant flow through the HVAC heater circuit
• Fogging or sweet coolant odor inside the cabin
• Corrosion-related heater core failure in older vehicles

Installation Notes and Tips

Verify core dimensions, tube diameter, and vehicle HVAC configuration before installation. This part is listed for front and N/A positions depending on application, and many fitments specify w/o AC. Confirm the vehicle’s original heater core style, especially on Chevrolet and GMC Blazer, Jimmy, C/K, R/V, and Suburban models, to ensure the correct replacement.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM requirements. The aluminum construction and application-specific sizing support a direct replacement approach for the covered Chevrolet and GMC fitments.

• Fits 1973-1974 Chevrolet Blazer, N/A
• Fits 1975-1984 Chevrolet C10, N/A
• Fits 1985-1987 Chevrolet C10, N/A
• Fits 1985-1986 Chevrolet K5 Blazer, Front
• Fits 1987-1991 Chevrolet Blazer, Front
• Fits 1979-1984 GMC C1500, N/A
• Fits 1985-1986 GMC C1500, N/A
• Fits 1987-1991 GMC Jimmy, N/A
• Fits 1991 GMC Jimmy, Front
• Fits 1979-1984 GMC K2500, N/A
• Fits 1985-1986 GMC K2500, N/A
• Fits 1989-1991 Chevrolet R1500 Suburban, Front
• Fits 1987-1990 GMC R1500 Suburban, N/A
• Fits 1991 GMC R1500 Suburban, Front
• Fits 1975-1992 Chevrolet P30, N/A
• Fits 1979-1992 GMC P3500, N/A