2025 Audi S3 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

7 Coolant / Antifreeze parts for the 2025 Audi S3 come from 2 brands — PRESTONE and VALVOLINE. The "Popular" part is PRESTONE AF3100.

In the Compatible With All Colors grade, PRESTONE supplies 1 part: grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. A representative part number is PRESTONE AF3055.

The Economy section lists 2 options from PRESTONE and VALVOLINE — the catalog's value-priced group. PRESTONE AF3100 is listed in this group.

In the Premium grade, PRESTONE supplies 3 parts: a step above OE specification in materials, tolerances or warranty terms. A representative part number is PRESTONE AF2100.

In the Standard Replacement grade, VALVOLINE supplies 1 part: built to original-equipment specification. A representative part number is VALVOLINE 904683.

This group includes PRESTONE AF3100, PRESTONE AF3055 and VALVOLINE 719009 and the remaining parts above.

This table covers the hard pipes and extra hoses in the coolant circuit. Read more

2 Coolant Hose / Pipe parts for the 2025 Audi S3 come from 2 brands — REIN and VAICO.

This group includes REIN CHP0663 and VAICO V105893.

This table covers the Coolant Hose Connector flanges. Read more

This group shows a single part: VAICO V109425.

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

3 Coolant Reservoir Cap parts are listed for the 2025 Audi S3, from CALORSTAT, MOTORAD and REIN.

Part numbers include CALORSTAT RC0162, MOTORAD T93 and REIN CPE0039.

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

This group shows a single part: GPD 2711334.

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

5 Radiator parts for the 2025 Audi S3 come from 3 brands — CSF, NISSENS and GPD. The "Popular" part is CSF 3922.

The Economy section: 1 option from GPD. GPD 13529C is listed in this group.

Standard Replacement: 4 parts, from CSF and NISSENS. A representative part number is CSF 3922.

This group includes CSF 3922, GPD 13529C and CSF 4000 and the remaining parts above.

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

One part is listed for the 2025 Audi S3 — NISSENS 85866.

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

One part is listed for the 2025 Audi S3 — REIN AVM0728.

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

5 Temperature Sender / Sensor parts for the 2025 Audi S3 come from 5 brands — HOLSTEIN, STANDARD MOTOR PRODUCTS, NISSENS and 2 other brands. The "Popular" part is STANDARD MOTOR PRODUCTS TX275.

The Economy section: 1 option from HOLSTEIN. HOLSTEIN 2CTS0182 is listed in this group.

Standard Replacement: 3 parts, from STANDARD MOTOR PRODUCTS, NISSENS and WELLS. A representative part number is STANDARD MOTOR PRODUCTS TX275.

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

Listed part numbers: STANDARD MOTOR PRODUCTS TX275, HOLSTEIN 2CTS0182 and NISSENS 207067, plus the other parts above.

This table covers the seals at the thermostat housing and water outlet. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

This group shows a single part: MAHLE / CLEVITE C33480.

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

One part is listed for the 2025 Audi S3 — MOTORAD CH3116.

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

7 Water Pump parts are listed for the 2025 Audi S3, from FOUR SEASONS, US MOTOR WORKS, FVP and 3 other brands. US MOTOR WORKS US8124 carries the "Popular" badge.

Economy: 2 parts, from US MOTOR WORKS and FVP. A representative part number is US MOTOR WORKS US8124.

The Standard Replacement section: 5 options from FOUR SEASONS, GMB, PIERBURG and 1 other brand. GMB 1803050 is listed in this group.

This group includes US MOTOR WORKS US8124 and GMB 1803050 and the remaining parts above.