The 2026 Audi S3 has 9 cooling system parts with verified fitment on this page — 6 part types and 6 brands, covering the 2.0L L4 Turbocharged engine. Each part includes a manufacturer part number and application notes.
On the 2026 Audi S3, the cooling system system keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses. Most of the listed parts are Coolant / Antifreeze (2 parts), Coolant Reservoir Cap (2 parts) and Water Pump (2 parts). The other 3 part types cover the remaining 3 parts.
The 2026 Audi S3 came with a single engine, the 2.0L L4 Turbocharged, and every part is verified against it.
6 brands supply cooling system parts for the 2026 Audi S3, led by REIN (3 parts), VALVOLINE (2 parts) and CALORSTAT (1 part), plus 3 more brands. Quality grades include Economy and Standard Replacement.
Each part number listed for the 2026 Audi S3 opens a page with every vehicle that part fits.
Coolant / Antifreeze
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE | 719009 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi-Vehicle Yellow1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE | 904683 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | HT-12 Pink1 Gallon | View on Amazon |
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.
VALVOLINE supplies both parts for the 2026 Audi S3.
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.
Part numbers include VALVOLINE 719009 and VALVOLINE 904683.
Coolant Hose / Pipe
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | CHP0663 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pipe | View on Amazon |
This table covers the hard pipes and extra hoses in the coolant circuit.
One part is listed for the 2026 Audi S3 — REIN CHP0663.
Coolant Reservoir Cap
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CALORSTAT | RC0162 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Maximum Pressure Rating: 23.0 PS | View on Amazon |
| REIN | CPE0039 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
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.
2 Coolant Reservoir Cap parts for the 2026 Audi S3 come from 2 brands — CALORSTAT and REIN.
This group includes CALORSTAT RC0162 and REIN CPE0039.
Radiator Mount
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | AVM0728 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Center Lower | View on Amazon |
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.
This group shows a single part: REIN AVM0728.
Thermostat / Thermostat Housing / Water Outlet Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MAHLE / CLEVITE | C33480 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Molded Rubber | View on Amazon |
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.
One part is listed for the 2026 Audi S3 — MAHLE / CLEVITE C33480.
Water Pump
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| US MOTOR WORKS | US8124 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Base Model | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SALERI | PA1532 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | MechanicalNon-switchable water pump | View on Amazon |
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.
2 Water Pump parts for the 2026 Audi S3 come from 2 brands — US MOTOR WORKS and SALERI.
The Economy section: 1 option from US MOTOR WORKS. US MOTOR WORKS US8124 is listed in this group.
Standard Replacement: 1 part, from SALERI. A representative part number is SALERI PA1532.
Part numbers include US MOTOR WORKS US8124 and SALERI PA1532.
Buying Cooling System Parts for a 2026 Audi S3
On this vehicle, the cooling system system keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses.
- Confirm you have the 2.0L L4 Turbocharged engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the thermostat and refill with fresh coolant whenever you change a water pump or radiator; original hoses on an older vehicle are on borrowed time.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Coolant / Antifreeze and Coolant Reservoir Cap .
Frequently Asked Questions
How many cooling system parts fit the 2026 Audi S3?
Our catalog currently lists 9 cooling system parts for the 2026 Audi S3 across 6 subcategories and 6 brands, covering the 2.0L L4 Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 2026 Audi S3?
Common symptoms include a rising temperature gauge in traffic, sweet-smelling steam, crusty deposits around hose clamps, or a heater that blows cold. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the thermostat and refill with fresh coolant whenever you change a water pump or radiator; original hoses on an older vehicle are on borrowed time.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2026 Audi S3 was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2026 Audi S3?
Every part on this page is matched to the 2.0L L4 Turbocharged engine. Then replace coolant with the exact specification the manufacturer calls for — mixing chemistries can gel and block small passages. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2026 Audi S3
Cooling System Parts for Other Audi S3 Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.