Nissens 73943 HVAC Heater Core

Nissens 73943 HVAC Heater Core

The Nissens 73943 HVAC heater core is built for direct-fit thermal performance in select Audi and Volkswagen applications. With an aluminum core and aluminum tanks, it supports efficient heat transfer for consistent cabin heat in vehicles such as the Audi TT Quattro and Volkswagen Golf R.

• Aluminum core material for efficient heat exchange
• Aluminum tank construction for corrosion-resistant thermal performance
• Brazed cooling fins for a durable, compact heat exchanger design
• Pipe included for application-specific installation requirements
• OE-style replacement for select Audi and Volkswagen HVAC systems

Application Coverage

Compatible with select 2015-2019 Audi and Volkswagen models, including Fits 2019 Audi Q3, N/A; Fits 2019 Audi TT Quattro, N/A; Fits 2019 Audi TT RS Quattro, N/A; Fits 2019 Audi TTS Quattro, N/A; Fits 2019 Volkswagen Arteon, N/A; Fits 2016-2018 Audi TT Quattro, N/A; Fits 2018 Audi TT RS Quattro, N/A; Fits 2016-2018 Audi TTS Quattro, N/A; Fits 2015-2018 Volkswagen Golf R, N/A. Verify the exact vehicle build date before ordering, especially for late-2018 production cutoffs.

This part cross-references OE-style part numbers 5Q0819031A and 811506 for the same application.

What It Helps Resolve

• Weak or uneven cabin heat
• Restricted coolant flow through the heater circuit
• Leaking heater core causing coolant loss
• Fogging or sweet odor from HVAC coolant seepage
• Reduced defrost performance in cold weather

Installation Notes

Confirm fitment by year, model, and production date before installation. Inspect the HVAC case, coolant hoses, and seals for wear or contamination during replacement. Proper coolant refill and system bleeding are important after heater core service to restore normal heater operation.

Quality Assurance

Nissens develops and manufactures thermal management components to consistent quality standards, with product engineering focused on aftermarket fit and function. The 73943 heater core uses aluminum construction and brazed fins to support reliable heat transfer in the specified Audi and Volkswagen applications.