Audi Q3 Radiator: Specs, Fitment & Common Faults

On the Q3, related Audi models have genuinely had confirmed water pump recalls, with problems documented occurring between 30,000 and 70,000 miles.

Generation covered: this guide is for the third-generation Q3 (F3, 2018–present), with particular focus on 2018–2023 registered examples now old enough for parts to be a common search. Check your logbook or VIN if you're unsure which generation you have.

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OEM Part Number: confirm via VIN — radiators (aftermarket) Nissens 65303 / Valeo 735559

Accuracy note: Covers the Audi Q3 (F3 2018 on) as listed in the UK aftermarket catalogues. Radiators are sold by engine, gearbox and air-conditioning fitment, and one model usually has two or three different cores — a thicker core for diesels and automatics, a thinner one for small petrols — with different hose positions, so a radiator for the wrong engine will not connect up. The references below are UK aftermarket listings whose fitment lists name this generation, labelled by brand with the core size in mm; genuine numbers are those quoted against the listing. Check your engine code and whether the car has air conditioning against your VIN, and replace the coolant and bleed the system after fitting.

Radiators (aftermarket)	Nissens 65303 (650 x 396 x 22 mm, without cap, without expansion tank, with gaskets/seals); Nissens 65302 (600 x 425 x 26 mm); Valeo 735559 (650 x 448 x 24 mm, for vehicles without oil cooler); Valeo 735548 (650 x 449 x 34 mm, for vehicles without oil cooler); Valeo 735558 (650 x 411 x 24 mm, for vehicles without oil cooler); NRF 58392A (650 x 438 x 23 mm); NRF 58437 (650 x 434 x 32 mm)
Core sizes & variants	MQB radiator, 650 mm wide; 22-24 mm core for the 35 TFSI and 35 TDI, 32-34 mm for the 40/45 TFSI quattro and 40 TDI. The 45 TFSI also carries a small auxiliary radiator (NRF 550329, 185 x 196 x 26 mm, OE 5Q0121251HD) which is a separate part.
Genuine (OE) numbers quoted	None quoted in catalogue listings — order a genuine unit against your VIN
Fitment notes	Shares its cooling pack with the Tiguan II and Golf VII; quote the engine code and whether the car is quattro when ordering.

Accuracy note: genuinely worth knowing: automatic gearbox Q3s typically need a radiator with a built-in transmission oil cooler that manual versions don't have — ordering the manual-spec part for an automatic car will fit, but won't cool the gearbox oil properly.

Audi Q3 Radiator: The Part That Keeps Everything Else From Cooking

Few parts get less attention than this one, but on the Audi Q3, a neglected cooling system is behind the vast majority of avoidable serious engine failures. Noticing the early warning signs costs nothing and can save a genuinely large repair bill down the line.

Before you buy: radiator size and design vary significantly by engine size, transmission type, and whether your car has air conditioning. Always confirm against your VIN before ordering.

Audi Q3 Radiator: What It Does

On the Audi Q3, coolant runs through the radiator to shed engine heat into the airflow, keeping temperatures in check. On many automatics, a separate internal circuit inside the same unit also cools the transmission fluid — one more reason a mismatched part number causes more than just a cooling problem.

Audi Q3 Radiator: Watch: Replacing It

🎬 Watch: Volkswagen Tiguan Radiator Replacement DIY (2018-2024 VW MQB Tiguan 2.0t) (sister (vw tiguan mk2))

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No Q3-specific video found in 3 searches; same MQB front end.

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A Genuinely Useful Piece of Context Worth Knowing About Water Pump Issues — Audi Q3 Radiator

If you're facing a coolant leak or overheating concern, this is genuinely worth knowing: related Audi models have had confirmed recalls addressing water pump issues that could cause coolant to leak from the pump housing, with problems on this platform documented occurring anywhere from 30,000 to 70,000 miles.

A genuinely useful, real diagnostic technique worth trying: with the engine cold, removing the coolant bottle cap and having someone rev the engine while you watch the return hose is a simple way to confirm the water pump is genuinely circulating coolant properly.

It's also genuinely worth knowing an important clarification: genuine overheating caused directly by a failed water pump is actually quite rare, more often stemming from warped cylinder heads or a weakened head gasket left over from a previous overheating event.

Audi Q3 Radiator: Faults, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Radiator Guide for the three common failure modes, confirming fitment against your VIN, and OEM vs aftermarket guidance.

More Audi Radiator

The same part, covered across other Audi models.