Nissens 70226 HVAC Heater Core

Nissens 70226 HVAC Heater Core for Audi A4

The Nissens 70226 HVAC heater core is built for Audi A4, Audi A4 Quattro, Audi S4, and Audi RS4 applications from 2002-2009. It uses an aluminum core and aluminum tanks with brazed cooling fins for efficient heat transfer and consistent cabin heat output.

Key Features

• Aluminum core material for lightweight thermal performance
• Aluminum tank construction for corrosion-resistant durability
• Brazed cooling fins for stable heat exchange
• Core dimensions: 9.3700 in. height, 5.7100 in. length, 1.5700 in. width
• No pipe included
• Fits 2002-2009 Audi A4, 2002-2009 Audi A4 Quattro, 2004-2009 Audi S4, and 2007-2008 Audi RS4

Detailed Description

This Nissens heater core, part number 70226, is an HVAC heater core engineered for vehicles that rely on efficient coolant-to-air heat transfer inside the cabin. The aluminum core and tank design, combined with brazed cooling fins, supports steady thermal performance in the heating system. Nissens develops thermal management components with a focus on consistent manufacturing quality across its aftermarket range. This part cross-references Dorman - HELP 99373 for the same application.

Common Heater Core Issues It May Address

• Weak or uneven cabin heat
• Coolant odor inside the vehicle
• Fogging or film on interior glass from heater core leakage
• Restricted heat flow caused by an aging or clogged heater core
• Loss of heater performance in Audi A4, Audi A4 Quattro, Audi S4, or Audi RS4 models

Installation Notes and Tips

Verify vehicle fitment by year and model before installation. Inspect the HVAC system, coolant hoses, and seals for wear or contamination during replacement. Because no pipe is included, confirm the existing connection setup matches the replacement part before beginning the job. Proper coolant refill and system bleeding are important after installation to restore heater performance.

Quality Assurance

Nissens manufactures thermal and engine efficiency components to consistent quality standards and continues to develop aftermarket solutions as vehicle technology changes. Part number 70226 is built to support dependable HVAC service in the listed Audi applications.