Nissens 70231 HVAC Heater Core

Nissens 70231 HVAC Heater Core

The Nissens 70231 HVAC heater core is an aluminum replacement heat exchanger built for Audi cabin heating systems. It is engineered with brazed cooling fins and aluminum tanks for efficient heat transfer and consistent fitment across select Audi A4, A4 Quattro, A5, A5 Quattro, allroad, Q5, RS5, S4, S5, and SQ5 applications.

Compatible With 2008-2017 Audi A5 Quattro, 2009-2017 Audi Q5, 2008-2017 Audi S5, 2014-2017 Audi SQ5, 2009-2016 Audi A4, 2009-2016 Audi A4 Quattro, 2013-2016 Audi allroad, 2010-2016 Audi S4, 2013-2015 Audi RS5, and 2010-2014 Audi A5. Part number 70231 is also referenced for OE-style replacement searches on these vehicles.

Key Features

• Aluminum core material for efficient cabin heat transfer
• Aluminum tank construction for a lightweight thermal assembly
• Brazed cooling fins for durable heat exchanger construction
• Core dimensions: 8.8200 in. height, 7.0500 in. length, 1.2600 in. width
• Pipe included: No
• Part number: 70231

Detailed Description

Nissens develops thermal management components with a focus on aftermarket fit and manufacturing consistency. The 70231 HVAC heater core uses an aluminum core and aluminum tanks with brazed cooling fins to support heat transfer inside the vehicle’s heater box. This design is suited for Audi heating and climate control systems where a direct-fit heater core is required to restore warm air output through the cabin HVAC system. If you are searching for a heater core for Audi A4, Audi A4 Quattro, Audi A5, or Audi Q5 applications, Nissens 70231 is a relevant replacement part number to compare against OE references and interchange listings.

This part cross-references Dorman - HELP 99373 and Spectra Premium 98134 for the same application.

What It Helps Address

• Weak or inconsistent cabin heat
• Coolant odor inside the passenger compartment
• Fogging or film on interior glass from heater core leakage
• Restricted heat transfer caused by a worn or clogged heater core
• HVAC performance loss in Audi A4, A5, Q5, S4, S5, and SQ5 models

Installation Notes and Tips

Verify vehicle fitment by year, model, and HVAC configuration before installation. Inspect coolant hoses, seals, and related HVAC components during replacement, and flush the cooling system if contamination or debris is present. Because pipe included is listed as No, confirm the existing connection setup and reuse or source any required lines or fittings separately.

Quality Assurance

Nissens positions this heater core within its Genuine Nissens Quality standard, with products developed and manufactured to consistent thermal-component specifications for the aftermarket.