Performance Water Pump Kit for Audi S4 (2018-2025) 3.0L

Heavy-Duty Performance Water Pump Kit for 2018-2025 Audi S4 (B9/B9.5)

What it Does: The Performance Water Pump Kit replaces the leak-prone factory coolant circulation assembly on the 2018-2025 Audi S4 to restore precise thermal regulation and prevent catastrophic engine overheating.

The Stock Audi S4 Cooling System Failure

The factory EA839 3.0T engine utilizes a complex vacuum-actuated thermal management sleeve surrounding the mechanical water pump. Under heavy thermal cycling and boost pressure, OEM plastic housings warp, seals degrade, and the internal actuating diaphragm ruptures. Once breached, pressurized coolant migrates directly into the engine vacuum system, saturating the factory solenoids and thermal pneumatic valves. This common failure triggers cooling faults, erratic engine temps, and secondary vacuum-related DTCs across the B9 and B9.5 platform.

The Engineering Solution

This coordinated service solution addresses every structural failure point of OEM part 06M121013D and its revisions. Built with an all-aluminum pump housing and rigid aluminum impeller, it eliminates high-rpm cavitation and housing flex under extreme heat soak. The kit completely refreshes the variable cooling circuit by providing an updated mechanical water pump, matched thermostat, coolant crossover pipe, replacement pulley, fresh O-ring seals, and new electronic solenoid and thermal pneumatic control valves to permanently halt vacuum line contamination.

What's Included

• 1 Engine Water Pump Assembly with Pulley
• 1 Thermostat Assembly
• 1 Water Pipe
• 1 Pulley
• 2 Solenoid Valves
• 1 Thermal Pneumatic Valve
• O-Ring and Fixing Bolt Hardware Set

Technical Specifications

Compatibility

• 2018-2025 Audi S4 Sedan (3.0L Gas Turbo V6 CWGD)

Frequently Asked Questions & Fitment Warnings

Does this fit the B9/B9.5 S4?

Yes, this is a direct fit for the 2018-2025 Audi S4 equipped with the EA839 3.0L single-turbocharged engine. This kit does NOT fit earlier supercharged 3.0T engines (B8/B8.5 chassis) or naturally aspirated variants.

Is this an auxiliary electric pump or a mechanical pump?

This is the primary mechanical belt-driven engine water pump; it does not replace the secondary electric auxiliary coolant run-on pumps.

The Audi Precision Standard

Engineered to meet rigorous European performance tolerances, this kit maintains factory thermal calibration without triggering check engine lights or vacuum DTCs, ensuring leak-free performance under prolonged high-load conditions.