Valeo 439798 Alternator

Valeo 439798 Alternator Overview

The Valeo 439798 alternator is a 12-volt, 180-amp charging unit built with an internal regulator, internal fan, and clockwise rotation. It uses a 6-groove serpentine pulley and an aluminum housing for OE-style electrical performance in supported Audi, Porsche, and Volkswagen-group applications.

Valeo’s Alternator line focuses on original equipment replacement standards, and this premium unit is 100% new. That helps reduce the risk associated with remanufactured components while maintaining the charging output needed for modern electrical loads.

Key Features

• Part number: 439798
• 12-volt alternator with 180-amp output
• Internal voltage regulator
• Internal fan design
• Clockwise rotation
• 6-groove pulley for serpentine belt systems
• Aluminum housing for OE-style fit and durability
• Valeo OE family construction
• Technical number: FGN20S036

Detailed Description

Built for vehicles that require higher charging capacity, the Valeo 439798 alternator supports stable electrical output for systems with increased demand. It is a direct-fit style replacement for select Audi A4, A4 Quattro, A5, A5 Quattro, A6, A6 Quattro, allroad, Q5, Porsche Macan, and related applications listed below. This alternator cross-references Four Seasons 11106 for the same application.

As an OE-supplier-based replacement, this alternator is suited for drivers and repair shops looking for a factory-style charging solution for Audi A4 and Audi Q5 platforms, as well as Porsche Macan applications that call for the same configuration. The 180-amp rating, internal regulation, and serpentine pulley setup make it a practical match for vehicles with substantial electrical loads.

Vehicle Fitment

• Fits 2017-2018 Porsche Macan, N/A
• Fits 2013-2017 Audi A5 Quattro, N/A
• Fits 2017 Audi Q5, N/A
• Fits 2013-2016 Audi A4, N/A
• Fits 2013-2016 Audi A4 Quattro, N/A
• Fits 2015-2016 Audi A5, N/A
• Fits 2013-2016 Audi allroad, N/A
• Fits 2013-2016 Audi Q5, N/A
• Fits 2012-2015 Audi A6, N/A
• Fits 2013-2015 Audi A6 Quattro, N/A
• Fits 2013-2014 Audi A5, N/A
• Fits 2013 Audi A4 allroad, N/A

Common Issues This Part Can Address

• Low battery charging caused by a failing alternator
• Battery warning lights related to unstable charging output
• Electrical system voltage drop under accessory load
• Dim lights, weak starting, or intermittent charging performance
• Noise or bearing wear from an aging alternator assembly

Installation Notes

Verify pulley groove count, rotation direction, amperage rating, and connector style against the original unit before installation. Confirm vehicle-specific fitment by model year and engine application, especially on Audi Q5 and Audi A4 variants with different production dates. Inspect the serpentine belt and charging circuit condition during replacement to help avoid repeat failures.

Quality Assurance

Valeo has supplied original equipment electrical components since 1923, and this alternator is part of the Valeo OE family. It is manufactured as a new unit rather than a remanufactured assembly, supporting consistent performance for supported Audi, Porsche, and related applications.