Nissens 73640 HVAC Heater Core

Nissens 73640 HVAC Heater Core

The Nissens 73640 HVAC heater core is built for Volvo cabin heating systems that need reliable heat transfer and stable airflow performance. With an aluminum core, plastic tanks, and mechanically jointed cooling fins, it is engineered for consistent thermal efficiency in the vehicle’s heater circuit.

Compatible with Volvo C70, S70, V70, and 850 applications, this heater core is a direct-fit replacement for select 1993-2004 models. The Nissens 73640 is a practical choice when restoring cabin heat in a Volvo C70 heater core, Volvo S70 heater core, Volvo V70 heater core, or Volvo 850 heater core application.

Key Features

• Aluminum core for efficient heat transfer
• Plastic tank construction for OE-style fitment
• Mechanically jointed cooling fins for durable core assembly
• Pipe included: No
• Part number: 73640

Product Details

Nissens develops thermal management components with a focus on aftermarket fit and function. The 73640 heater core uses an aluminum core paired with plastic tanks, matching the construction commonly used in modern HVAC systems. Its compact dimensions help support proper installation within the heater case, while the mechanically jointed fin design supports consistent airflow through the core.

This part cross-references Dorman - HELP 99277 for the same application. It also cross-references 93719 and 812327 for related fitment coverage.

What It Helps Address

• Weak or uneven cabin heat
• Coolant odor inside the passenger compartment
• Restricted heater core flow from age or buildup
• Leaking heater core housing symptoms
• Loss of defrost performance in cold weather

Installation Notes

Verify heater case dimensions, hose routing, and OE-style connections before installation. Because pipes are not included, reuse or source the correct external connections as required by the vehicle. Flush the cooling system and inspect related hoses, clamps, and coolant condition before placing the vehicle back in service.

Quality Assurance

Nissens positions this component within its Genuine Nissens Quality standard, with development and manufacturing focused on thermal system performance and aftermarket reliability. The part is built to support the fitment requirements of Volvo 850, Volvo S70, Volvo V70, and Volvo C70 heater core applications.

• Fits 1998-2004 Volvo C70, N/A
• Fits 1998-2000 Volvo S70, N/A
• Fits 1998-2000 Volvo V70, N/A
• Fits 1993-1997 Volvo 850, N/A