Nissens 707278 HVAC Heater Core

Nissens HVAC Heater Core 707278

The Nissens 707278 HVAC heater core is built to OE specifications for select Audi and Volkswagen applications. It uses aluminum construction with brazed cooling fins to support consistent heat transfer and a precise fit in the HVAC module cassette.

Key Features

• Aluminum core and aluminum tank construction
• Brazed cooling fins for efficient heat exchange
• 0.75 in inlet and outlet pipe diameters
• Normal design for direct HVAC heater core replacement
• Finished to fit smoothly into the mounting cassette on the HVAC module
• Part number 707278 for easy identification

Detailed Description

Nissens heater cores are manufactured and tested to OE specifications, with life testing that includes vibration, pressure impulse, thermal expansion, corrosion, and burst evaluation. This process helps reduce the risk of leakage, poor cabin heat output, and residue-related contamination. The 707278 heater core is a direct-fit HVAC heater core for vehicles including the Audi Q3, Volkswagen Golf R, Volkswagen GTI, Audi TT Quattro, Audi TTS Quattro, Volkswagen Arteon, and Audi TT RS Quattro. This part cross-references OE number 5WA819031 for the same application.

What It Helps Address

• Weak or uneven cabin heat
• Coolant leakage at the heater core
• Restricted heat transfer from corrosion or internal buildup
• HVAC performance loss caused by a damaged core
• Fitment issues during heater core replacement on select Audi and Volkswagen models

Installation Notes and Tips

Verify the core dimensions before installation: 170 x 163 x 26 mm, with 0.75 in inlet and outlet pipe diameters. Confirm the HVAC module cassette condition, inspect hoses and seals, and flush the cooling system if contamination is present. This heater core does not include pipes.

Quality Assurance

Nissens manufactures and tests this heater core to OE-level specifications using durability and leak-focused validation methods. The aluminum construction and brazed fin design are intended to support reliable heat transfer and consistent fitment in the HVAC system.