8 Cooling system parts are listed for the 2026 Audi RS3, in 6 part types, covering the 2.5L L5 Turbocharged engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
The cooling system system on the 2026 Audi RS3 keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses. The largest groups are Coolant / Antifreeze (2 parts), Coolant Reservoir Cap (2 parts) and Coolant Hose / Pipe Seal (1 part). The other 3 part types cover the remaining 3 parts.
The 2026 Audi RS3 came with a single engine, the 2.5L L5 Turbocharged, and every part is verified against it.
6 brands supply cooling system parts for the 2026 Audi RS3, led by VALVOLINE (2 parts), REIN (2 parts) and AJUSA (1 part), plus 3 more brands. Quality grades include Economy and Standard Replacement.
Each part number listed for the 2026 Audi RS3 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 RS3.
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.
Coolant Hose / Pipe Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA | 01165600 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Connector / Flange | View on Amazon |
This table covers the seals at the Coolant Hose / Pipe. 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.
This group shows a single part: AJUSA 01165600.
Coolant Reservoir Cap
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CALORSTAT | RC0162 | 🇺🇸 US 🇨🇦 CA | 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 RS3 come from 2 brands — CALORSTAT and REIN.
Listed part numbers: CALORSTAT RC0162 and REIN CPE0039.
Radiator
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD | 13174C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
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.
One part is listed for the 2026 Audi RS3 — GPD 13174C.
Radiator Mount
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | AVM0728 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
Temperature Sender / Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HOLSTEIN | 2CTS0490 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
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.
One part is listed for the 2026 Audi RS3 — HOLSTEIN 2CTS0490.
Buying Cooling System Parts for a 2026 Audi RS3
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 2.5L L5 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 RS3?
Our catalog currently lists 8 cooling system parts for the 2026 Audi RS3 across 6 subcategories and 6 brands, covering the 2.5L L5 Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 2026 Audi RS3?
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 RS3 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 RS3?
Every part on this page is matched to the 2.5L L5 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 RS3
Cooling System Parts for Other Audi RS3 Years
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