The 2025 Audi A4 has 15 cooling system parts with verified fitment on this page — 8 part types and 10 brands, covering the 2.0L L4 Turbocharged engine. Each part includes a manufacturer part number and application notes.
On the 2025 Audi A4, 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. 9 parts of the 15 listed are Intercooler (4 parts), Radiator (3 parts) and Coolant / Antifreeze (2 parts). The other 5 part types cover the remaining 6 parts.
The 2025 Audi A4 came with a single engine, the 2.0L L4 Turbocharged, and every part is verified against it.
10 brands supply cooling system parts for the 2025 Audi A4, led by REIN (4 parts), VALVOLINE (2 parts) and NISSENS (2 parts), plus 7 more brands. Quality grades include Economy and Standard Replacement.
Each part number listed for the 2025 Audi A4 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 2025 Audi A4.
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
| 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 2025 Audi A4 — REIN CHP0663.
Coolant Reservoir
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | EPT0281 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | A4 Quattrowithout Cap | View on Amazon |
| VAICO | V105349 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | A4 QuattroGrade: AM | View on Amazon |
This table covers the overflow / expansion tanks that hold extra coolant.
2 Coolant Reservoir parts for the 2025 Audi A4 come from 2 brands — REIN and VAICO.
Part numbers include REIN EPT0281 and VAICO V105349.
Intercooler
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD | 2711413 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | A4 Quattro | View on Amazon |
| HELLA | 366340871 | 🇺🇸 US | View on Amazon | |
| NISSENS | 961466 | 🇺🇸 US | View on Amazon | |
| TECHPRO | AU3012112 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | A4 Quattrowithout ULTRA Engine | View on Amazon |
This table covers the intercoolers that cool turbo or supercharger charge air.
4 Intercooler parts are listed for the 2025 Audi A4, from GPD, HELLA, NISSENS and 1 other brand.
Part numbers include GPD 2711413, HELLA 366340871 and NISSENS 961466, among others listed above.
Radiator
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CSF | 4030 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| NISSENS | 606573 | 🇺🇸 US | Brazed cooling fins | View on Amazon |
| SPECTRA PREMIUM | CU13665 | 🇺🇸 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.
3 Radiator parts are listed for the 2025 Audi A4, from CSF, NISSENS and SPECTRA PREMIUM.
This group includes CSF 4030, NISSENS 606573 and SPECTRA PREMIUM CU13665.
Radiator Fan Shroud
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SKP | SK621318 | 🇺🇸 US | View on Amazon |
This table covers the shrouds that duct air through the fan and radiator.
One part is listed for the 2025 Audi A4 — SKP SK621318.
Radiator Insulator Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | AVM0730 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | A4 Quattro | View on Amazon |
This table covers the Radiator Insulator sleeves.
This group shows a single part: REIN AVM0730.
Radiator Mount
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | AVM0729 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | UpperA4 Quattro | 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 AVM0729.
Buying Cooling System Parts for a 2025 Audi A4
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: Intercooler and Radiator .
Frequently Asked Questions
How many cooling system parts fit the 2025 Audi A4?
Our catalog currently lists 15 cooling system parts for the 2025 Audi A4 across 8 subcategories and 10 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 2025 Audi A4?
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 2025 Audi A4 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 2025 Audi A4?
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 2025 Audi A4
Cooling System Parts for Other Audi A4 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.