Nissens 77604 HVAC Heater Core

Nissens 77604 HVAC Heater Core

The Nissens 77604 HVAC heater core is built for direct replacement in select Hyundai applications, including Accent, Tiburon, and Elantra models. With aluminum core and tank construction plus brazed cooling fins, it is engineered for efficient heat transfer and dependable cabin heat performance.

• Aluminum core material for thermal efficiency
• Aluminum tank material for consistent construction
• Brazed cooling fins for durable heat exchange
• Pipe included for application-specific replacement needs
• OE-style fitment for select Hyundai heating systems

Fitment Coverage

• Fits 1995-2005 Hyundai Accent, N/A
• Fits 1997-2001 Hyundai Tiburon, N/A
• Fits 1996-2000 Hyundai Elantra, N/A

Detailed Product Information

This heater core uses aluminum for both the core and tanks, a construction that supports efficient transfer of heat through the HVAC system. The brazed cooling fin design helps maintain a stable internal structure, while the included pipe supports proper system connection where required by the application. Nissens 77604 is a practical replacement choice for Hyundai Accent, Hyundai Tiburon, and Hyundai Elantra heating repairs when the original heater core is leaking, restricted, or no longer delivering consistent cabin heat.

This part cross-references National 99170 for the same application.

Common Issues This Part Can Address

• Weak or uneven cabin heat
• Coolant odor inside the vehicle
• Heater core leakage
• Restricted coolant flow through the HVAC circuit
• Fogging caused by heater core seepage

Installation Notes and Tips

Confirm vehicle year, model, and HVAC configuration before installation. Flush the cooling system if contamination or debris is present, and inspect hoses, clamps, and seals for wear before reassembly. After installation, refill and bleed the cooling system according to the vehicle service procedure to help prevent air pockets and restore proper heater performance.

Quality Assurance

Nissens develops thermal management components to high manufacturing standards and continuously updates its aftermarket product range to match changing vehicle technology. Part number 77604 is built as a quality replacement heater core for the listed Hyundai applications.