Nissens 71770 HVAC Heater Core

Nissens 71770 HVAC Heater Core

The Nissens 71770 HVAC heater core is built for direct-fit heating system service in select Volvo and Mazda applications. It uses aluminum for both the core and tanks, with brazed cooling fins to support efficient heat transfer and consistent cabin heat output.

Key Features

• Aluminum core material and aluminum tank material
• Brazed cooling fins for efficient thermal performance
• Pipe included for application-specific installation
• OE-style replacement for HVAC heater core service
• Part number 71770 for easy identification

Product Details

Nissens 71770 is an HVAC heater core developed for thermal system repair where cabin heat output has dropped or the original core has failed. Nissens focuses on essential thermal and engine efficiency components, and this heater core reflects that approach with aluminum construction and brazed fin design. It is a direct replacement option for 2008-2013 Volvo C30, 2006-2013 Volvo C70, 2004-2011 Volvo S40, 2005-2011 Volvo V50, 2007 Mazda 3, 2004-2006 Mazda 3, and 2006 Mazda 5 applications. This part cross-references Spectra Premium 98089 for the same application.

What It Helps Fix

• Weak or uneven cabin heat
• Coolant seepage from a damaged heater core
• Restricted heat transfer from internal corrosion or blockage
• HVAC performance loss caused by a failing core assembly

Installation Notes and Tips

Verify vehicle year, engine, and HVAC configuration before installation. Inspect hoses, seals, and coolant condition during replacement to reduce repeat service. Because heater core access can require dashboard or HVAC case removal on many vehicles, confirm all connections and pipe routing before reassembly. Fits 2008-2013 Volvo C30, N/A; Fits 2006-2013 Volvo C70, N/A; Fits 2004-2011 Volvo S40, N/A; Fits 2005-2011 Volvo V50, N/A; Fits 2007 Mazda 3, N/A, to 06/22/2007; Fits 2004-2006 Mazda 3, N/A; Fits 2006 Mazda 5, N/A, to 11/01/2005.

Quality Assurance

Nissens manufactures thermal management components to consistent quality standards, with product development aligned to changing aftermarket vehicle requirements. Part number 71770 is built as a replacement heater core for the listed Volvo and Mazda applications.