Nissens 73940 HVAC Heater Core

Nissens 73940 HVAC Heater Core

The Nissens 73940 HVAC heater core is built for vehicles that need reliable cabin heat and stable thermal performance. It uses an aluminum core with plastic tanks and mechanically jointed cooling fins for a practical OE-style construction.

Compatible with select Volkswagen Cabriolet, Porsche 924, Volkswagen Quantum, Audi 4000, Audi 4000 Quattro, Audi Coupe, and Audi Quattro applications, this heater core is a direct-fit replacement for many late-1980s and early-1990s European vehicles. The Nissens 73940 part number is also a useful reference when comparing heater core options for these platforms.

• Aluminum core material for efficient heat transfer
• Plastic tank construction
• Mechanically jointed cooling fins
• Pipe included: No
• Core dimensions: 9.2100 in. H x 6.1800 in. L x 1.5700 in. W

Detailed Product Overview

Nissens develops thermal management components with a focus on consistent manufacturing quality and aftermarket application coverage. This heater core is designed around the listed dimensions and construction details, making it a practical replacement for vehicles that need restored heater performance without changing the original HVAC layout. The Nissens 73940 heater core is a fitment-based solution for Volkswagen Cabriolet and Quantum models, plus Audi 4000, Audi 4000 Quattro, Audi Coupe, Audi Quattro, and Porsche 924 applications.

This part cross-references Spectra Premium 94652 for the same application.

What This Heater Core Helps Address

• Weak or inconsistent cabin heat
• Coolant seepage from a worn heater core
• Restricted heat output from internal blockage
• HVAC performance loss in aging Audi and Volkswagen systems
• Replacement needs after corrosion or fin damage

Installation Notes and Tips

Verify core dimensions, hose routing, and HVAC case fitment before installation. This unit does not include pipes, so reuse or source the correct vehicle-specific connections as needed. For 1986-1988 Volkswagen Quantum applications, note that A/C radiator applications may vary by year, make, and model of vehicle, and Exc. A/C listings should be checked carefully against the vehicle build.

• Fits 1985-1993 Volkswagen Cabriolet, N/A
• Fits 1987-1988 Porsche 924, N/A
• Fits 1986-1988 Volkswagen Quantum, N/A, Exc. A/C
• Fits 1986-1988 Volkswagen Quantum, N/A, A/C radiator applications may vary by year, make, and model of vehicle.
• Fits 1985-1988 Volkswagen Quantum, N/A
• Fits 1985-1987 Audi 4000, N/A
• Fits 1985-1987 Audi 4000 Quattro, N/A
• Fits 1985-1987 Audi Coupe, N/A
• Fits 1985 Audi Quattro, N/A

Quality Assurance

Nissens is a market-leading manufacturer of thermal and engine efficiency components, and its products are developed and manufactured to a consistent quality standard. The 73940 heater core reflects that approach with an aluminum-and-plastic construction suited to the listed applications.