Four Seasons 98651 HVAC Heater Core

Four Seasons 98651 Heater Core Overview

The Four Seasons 98651 heater core is an aluminum HVAC replacement built for select Volkswagen, Audi, and Porsche applications. It is sized to match the listed dimensions and meets or exceeds OEM requirements for direct-fit service in vehicles such as the Volkswagen Cabriolet, Volkswagen Quantum, Audi 4000, and Porsche 924.

Four Seasons Heater Core line parts are focused on accurate fitment and OE-style construction for heating system repair. This aluminum heater core uses a compact core design with 9-1/4 in. height, 6-1/4 in. width, and 1-5/8 in. thickness, with 0.625 in. tube connections.

Key Features

• Part number: 98651
• Aluminum heater core construction
• Core dimensions: 9-1/4 in. x 6-1/4 in. x 1-5/8 in.
• Tube size: 0.625 in. on both connections
• Meets or exceeds OEM requirements
• Four Seasons Heater Core product line
• Direct replacement for select air-conditioning and non-air-conditioning applications listed below

Detailed Description

Four Seasons 98651 is an HVAC heater core designed for vehicles that rely on a compact aluminum core layout. The unit’s dimensions and tube sizing support proper integration into the heater box, helping restore cabin heat performance in older import platforms. This part is listed for 1980-1993 Volkswagen and Audi applications, plus 1987-1988 Porsche 924 coverage, including Volkswagen Cabriolet, Quantum, Jetta, Rabbit Convertible, Rabbit Pickup, Audi 4000, Audi 4000 Quattro, Audi Coupe, Audi Quattro, and Porsche 924. This part cross-references APDI 9010146 and Nissens 73940 for the same application.

What It Helps Fix

• Weak or no cabin heat
• Coolant seepage from a leaking heater core
• Fogging or sweet odor caused by heater core failure
• Restricted heat output from a clogged core
• HVAC performance loss in Volkswagen Cabriolet, Volkswagen Quantum, Audi 4000, and Porsche 924 models

Installation Notes and Tips

Verify the listed dimensions, tube diameter, and vehicle application before installation. This heater core is not adjustable in pipe positioning, so alignment should be checked against the original unit and heater box layout. Some Volkswagen Jetta, Quantum, Rabbit Convertible, and Rabbit Pickup applications are listed for models without air conditioning; confirm the vehicle’s HVAC configuration before ordering. Professional installation is recommended because heater core replacement typically requires access to the HVAC case and cooling system.

Quality Assurance

Four Seasons identifies this heater core as meeting or exceeding OEM requirements, supporting OE-style service replacement for the listed applications. The Four Seasons 98651 heater core is built for consistent fit and function in compatible Volkswagen, Audi, and Porsche heating systems.