Nissens 70221 HVAC Heater Core

Nissens 70221 Heater Core Overview

The Nissens 70221 HVAC heater core is a direct-fit thermal component for select Audi applications, including Audi 80, Audi 80 Quattro, Audi 90, Audi 90 Quattro, and Audi Coupe Quattro models. Built with an aluminum core and plastic tanks, it is engineered for efficient cabin heat transfer in vehicles that use the specified 234x158x42 dimensions.

For buyers searching for an Audi 80 heater core, Audi 90 heater core, or Nissens 70221 replacement, this part provides the core construction and fitment details needed for a precise HVAC repair.

Key Features

• Aluminum core for effective heat exchange
• Plastic tank construction
• Mechanically jointed cooling fins
• Core dimensions: 9.2500 in. H x 6.1000 in. L x 1.6500 in. W
• No pipes included
• Fits select Audi HVAC heater core applications with 234x158x42 dimensions

Detailed Description

Nissens 70221 is an HVAC heater core built for select Audi platforms from 1988 through 1994. It uses an aluminum core paired with plastic tanks and mechanically jointed cooling fins to support heat transfer within the vehicle’s heater assembly. This part cross-references 812237 and 893819031A for the same application.

Compatible vehicle coverage includes Fits 1988-1992 Audi 80, N/A; Fits 1988-1992 Audi 80 Quattro, N/A; Fits 1988-1991 Audi 90, N/A; Fits 1988-1991 Audi 90 Quattro, N/A; Fits 1990-1991 Audi Coupe Quattro, N/A; and Fits 1993-1994 Audi 90 Quattro, N/A. If you are replacing a worn Audi 80 heater core or servicing an Audi 90 Quattro HVAC system, confirm the listed dimensions before installation.

Common Problems This Part Addresses

• Weak or uneven cabin heat output
• Coolant leakage inside the HVAC case
• Restricted heat transfer from a corroded or clogged heater core
• Fogging or dampness caused by heater core seepage
• HVAC performance loss in older Audi 80 and Audi 90 models

Installation Notes and Tips

Verify the heater core dimensions and vehicle application before removal of the HVAC case. Inspect hoses, seals, and surrounding components for wear during replacement, and confirm that the system is properly bled after installation. Because no pipes are included, reuse or source the required connections as needed for the vehicle.

Quality Assurance

Nissens develops thermal management components for the aftermarket with a focus on consistent manufacturing standards and application-specific fitment. The 70221 heater core reflects that approach with OE-style construction details for select Audi HVAC systems.