Heater Core Overview

The One Stop Solutions 98778 heater core is a direct replacement built to match original equipment form and function. It uses premium aluminum construction and cadmium-plated tubes to help resist premature failure in demanding HVAC service.

Compatible With Buick Roadmaster, Chevrolet Caprice, Chevrolet Impala, and Cadillac full-size applications listed below, this heater core is a practical choice for restoring cabin heat performance. The 98778 is individually pressure tested and includes the foam and accessories needed for the unit.

Key Features

• Drop-in fit with OE-style form and function
• Premium grade aluminum construction
• Cadmium-plated tubes inside and out for added corrosion resistance
• Individually pressure tested before release
• Includes foam and accessories

Detailed Description

OSC Premium New Automotive Heater Cores are engineered as direct replacements for original equipment copper-style heater cores, while using aluminum construction for improved durability characteristics. The 98778 is built for HVAC repair work where the original core has leaked, restricted coolant flow, or lost heat transfer efficiency. This part cross-references Remy 94778 and 398270 for the same application.

Fits 1994-1996 Buick Roadmaster, N/A. Fits 1996 Cadillac Commercial Chassis, N/A. Fits 1993 Cadillac Commercial Chassis, N/A. Fits 1996 Cadillac Fleetwood, N/A. Fits 1994-1996 Chevrolet Caprice, N/A. Fits 1994-1996 Chevrolet Impala, N/A. Fits 1994 Chevrolet Commercial Chassis, N/A. Fits 1993 Cadillac 60 Special, N/A.

Common Repair Reasons

• Loss of cabin heat from a leaking or clogged heater core
• Coolant odor or moisture inside the HVAC case
• Reduced heat output during cold-weather driving
• Failure caused by age, vibration, or thermal cycling

Installation Notes

Verify the vehicles HVAC configuration and compare the original core before installation. The heater core should be installed with the included foam and accessories to help maintain proper sealing and airflow through the HVAC case. Confirm coolant system condition and flush the system if contamination is present.

Quality Assurance

Each 98778 heater core is individually pressure tested and built from premium aluminum with cadmium-plated tubes for added resistance to premature failure. OSC positions this heater core as a direct replacement for OE-style applications.