This page lists 5 cooling system parts for the 2026 Audi Q4, across 3 part types, covering the ELECTRIC engine. Every part shows its brand, manufacturer part number and fitment notes.
On the 2026 Audi Q4, 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. All 5 listed parts are Coolant Reservoir Cap (2 parts), Radiator Mount (2 parts) and Coolant / Antifreeze (1 part).
Every part on this page is matched to the ELECTRIC — the only engine offered in the 2026 Audi Q4.
The most listed brands for 2026 Audi Q4 cooling system parts are REIN (3 parts), VALVOLINE (1 part) and CALORSTAT (1 part).
Each part number listed for the 2026 Audi Q4 opens a page with every vehicle that part fits.
Coolant / Antifreeze
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE | 904683 | 🇺🇸 US 🇨🇦 CA | 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.
This group shows a single part: VALVOLINE 904683.
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 | 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 are listed for the 2026 Audi Q4, from CALORSTAT and REIN.
Listed part numbers: CALORSTAT RC0162 and REIN CPE0039.
Radiator Mount
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| REIN | AVM0748 | 🇺🇸 US 🇨🇦 CA | Left Lower | View on Amazon |
| REIN | AVM0749 | 🇺🇸 US 🇨🇦 CA | Right 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.
REIN supplies both parts for the 2026 Audi Q4.
Part numbers include REIN AVM0748 and REIN AVM0749.
Buying Cooling System Parts for a 2026 Audi Q4
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 ELECTRIC 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 Reservoir Cap and Radiator Mount .
Frequently Asked Questions
How many cooling system parts fit the 2026 Audi Q4?
Our catalog currently lists 5 cooling system parts for the 2026 Audi Q4 across 3 subcategories and 3 brands, covering the ELECTRIC engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 2026 Audi Q4?
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 Q4 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 Q4?
Every part on this page is matched to the ELECTRIC 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 Q4
Cooling System Parts for Other Audi Q4 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.