2021 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

15 Coolant / Antifreeze parts are listed for the 2021 Audi S4, from PRESTONE, PEAK, PENTOSIN and 2 other brands. PRESTONE AF3100 carries the "Popular" badge. All of them fit every engine offered in the 2021 S4.

The Compatible With All Colors section lists 1 option from PRESTONE — grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. PRESTONE AF3055 is listed in this group.

In the Economy grade, PRESTONE, VALVOLINE and PEAK supply 3 parts: the catalog's value-priced group. A representative part number is PRESTONE AF3100.

The Premium section lists 5 options from PRESTONE and PEAK — a step above OE specification in materials, tolerances or warranty terms. PRESTONE AF2100 is listed in this group.

The Standard Replacement section lists 6 options from PENTOSIN, AISIN, PEAK and 1 other brand — built to original-equipment specification. AISIN ACE010 is listed in this group.

This table covers the Coolant Hose Flange plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes. Read more

One part is listed for the 2021 Audi S4 — ÜRO PARTS 357121140.

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

2 Coolant Reservoir parts for the 2021 Audi S4 come from 2 brands — REIN and VAICO. Every part fits both the 3.0L V6 Supercharged and the 3.0L V6 Turbocharged.

Listed part numbers: REIN EPT0271 and VAICO V105349.

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

2 Coolant Reservoir Cap parts for the 2021 Audi S4 come from 2 brands — MOTORAD and ÜRO PARTS. Every part fits both the 3.0L V6 Supercharged and the 3.0L V6 Turbocharged.

Listed part numbers: MOTORAD T111 and ÜRO PARTS 4M0121321Q.

This table covers the intercoolers that cool turbo or supercharger charge air. Read more

3 Intercooler parts are listed for the 2021 Audi S4, from GPD, TECHPRO and TYC.

Listed part numbers: GPD 2711414, TECHPRO AU3012113 and TYC 18105.

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 2021 Audi S4, from MAHLE / CLEVITE and NISSENS.

This group includes MAHLE / CLEVITE CR960000S and NISSENS 606578.

This table covers the fan assemblies (and clutches, where listed) that pull air through the radiator. Read more

5 Radiator Fan Assembly parts for the 2021 Audi S4 come from 3 brands — VEMO, GPD and UAC. The "Popular" part is UAC FA50946C. Every part fits both the 3.0L V6 Supercharged and the 3.0L V6 Turbocharged.

The Economy section: 4 options from VEMO and GPD. GPD 2812266 is listed in this group.

Standard Replacement: 1 part, from UAC. A representative part number is UAC FA50946C.

This group includes UAC FA50946C, GPD 2812266 and VEMO V15011943 and the remaining parts above.

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

One part is listed for the 2021 Audi S4 — SKP SK621318.

This table covers the Radiator insulators. Read more

2 Radiator Insulator parts for the 2021 Audi S4 come from VNE. Every part fits both the 3.0L V6 Supercharged and the 3.0L V6 Turbocharged.

This group includes VNE 41000073 and VNE 41000074.

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

6 Temperature Sender / Sensor parts are listed for the 2021 Audi S4, from GPD, BECK/ARNLEY, WALKER PRODUCTS and 3 other brands. BECK/ARNLEY 1581679 carries the "Popular" badge. 4 parts fit every engine; the other 2 are engine-specific.

Economy: 1 part, from GPD. A representative part number is GPD 1814521.

The Standard Replacement section: 5 options from BECK/ARNLEY, WALKER PRODUCTS, NISSENS and 2 other brands. BECK/ARNLEY 1581679 is listed in this group.

Part numbers include BECK/ARNLEY 1581679, GPD 1814521 and WALKER PRODUCTS 2112035, among others listed 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

2 Thermostat parts for the 2021 Audi S4 come from 2 brands — CALORSTAT and MOTORAD. Every part fits both the 3.0L V6 Supercharged and the 3.0L V6 Turbocharged.

This group includes CALORSTAT TE7367103J and MOTORAD 1229221.

This table covers the housings and outlets the thermostat sits in. Read more

This group shows a single part: VEMO V10990020.

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

10 Water Pump parts for the 2021 Audi S4 come from 7 brands — PIERBURG, FOUR SEASONS, BECK/ARNLEY and 4 other brands. The "Popular" part is BECK/ARNLEY 1312513. 7 parts fit every engine; the other 3 are engine-specific.

The Economy section: 2 options from BECK/ARNLEY and VAICO. BECK/ARNLEY 1312513 is listed in this group.

Standard Replacement: 7 parts, from PIERBURG, FOUR SEASONS, GATES and 1 other brand. A representative part number is GATES 41568E.

1 further part sits outside the graded sections, with the same engine-level match.