2025 Audi S4 Cooling System Parts

This table covers the engine coolants and antifreeze formulations specified for this cooling system. Typical signs include a rising temperature gauge, rusty or sludged coolant, or a heater that blows cold. Use the chemistry named in the notes. Mixing silicate, OAT and HOAT formulas can gel in the radiator. Read more

VALVOLINE supplies both parts for the 2025 Audi S4.

In the Economy grade, VALVOLINE supplies 1 part: the catalog's value-priced group. A representative part number is VALVOLINE 719009.

The Standard Replacement section lists 1 option from VALVOLINE — built to original-equipment specification. VALVOLINE 904683 is listed in this group.

Listed part numbers: VALVOLINE 719009 and VALVOLINE 904683.

This table covers the overflow / expansion tanks that hold extra coolant. Read more

This group shows a single part: REIN EPT0271.

This table covers the caps on the overflow / expansion tank. Typical signs include a leak at the neck, a cap that will not hold pressure, or a missing tether. Match the pressure rating or thread in the notes — radiator, reservoir and fuel caps are not interchangeable. Read more

This group shows a single part: MOTORAD T111.

This table covers the radiators that dump engine heat to airflow through the core. Typical signs include overheating in traffic, a wet core, or coolant that disappears with no puddle. Replace the cap if it cannot hold the rated pressure, and bleed the system after the swap. Read more

2 Radiator parts are listed for the 2025 Audi S4, from MAHLE / CLEVITE and NISSENS.

This group includes MAHLE / CLEVITE CR960000S and NISSENS 606578.

This table covers the shrouds that duct air through the fan and radiator. Read more

One part is listed for the 2025 Audi S4 — SKP SK621318.

This table covers the Radiator Insulator sleeves. Read more

This group shows a single part: REIN AVM0730.

This table covers the Radiator mounts. Typical signs include a clunk on takeoff, a vibration at idle, or a separated rubber insert. Support the powertrain before unbolting a mount, and torque the fasteners in the notes. Read more

This group shows a single part: REIN AVM0729.

This table covers the senders that report coolant temperature to the gauge or ECU. Typical signs include a gauge that sits on empty or overheat, or a lamp that does not match what the engine is doing. Rule out the cluster and the wiring before replacing the sender. Read more

4 Temperature Sender / Sensor parts are listed for the 2025 Audi S4, from HOLSTEIN, NISSENS, VNE and 1 other brand.

Economy: 1 part, from HOLSTEIN. A representative part number is HOLSTEIN 2CTS0163.

The Standard Replacement section: 3 options from NISSENS, VNE and WELLS. NISSENS 207067 is listed in this group.

Listed part numbers: HOLSTEIN 2CTS0163, NISSENS 207067 and VNE 9408050, plus the other parts above.

This table covers the thermostats that open the coolant circuit at the specified temperature. Typical signs include slow warm-up, a gauge that climbs in traffic, or heat that never quite arrives. Replace the housing gasket with the thermostat and bleed the system so a trapped air pocket does not cook the new part. Read more

This group shows a single part: MOTORAD 1229221.

This table covers the pumps that circulate coolant through the block and radiator. Typical signs include coolant at the weep hole, pulley play, or a growl from the front of the engine. Replace the thermostat and refill with the specified coolant whenever the pump comes off. Read more

9 Water Pump parts for the 2025 Audi S4 come from 7 brands — FVP, FOUR SEASONS, REIN and 4 other brands. The "Popular" part is HELLA 358304701.

The Economy section: 2 options from FVP and REIN. FVP US8214 is listed in this group.

Standard Replacement: 4 parts, from FOUR SEASONS, GMB and NISSENS. A representative part number is FOUR SEASONS 89087.

3 further parts sit outside the graded sections, with the same engine-level match.

This group includes HELLA 358304701, FVP US8214 and REIN WPA0541 and the remaining parts above.