Audi A4 Radiator: Specs, Fitment & Common Faults

On the A4, a confirmed safety recall genuinely addressed water pump issues, with problems documented occurring between 30,000 and 70,000 miles — plus an important clarification that genuine water pump-caused overheating is actually rare.

Illustration for editorial purposes

OEM Part Numbers

Accuracy note: genuinely worth knowing: whether a A4 has air conditioning or a larger optional engine can change radiator sizing on some variants — fitment guides that only ask for model and year can still get this wrong, so cross-check the engine code where possible.

The Part That Keeps Everything Else From Cooking

Nothing about this component is glamorous, but almost every serious engine failure that isn't wear-related traces back to a cooling system problem left unaddressed. Catching the early signs here is genuinely cheap insurance against a much bigger bill.

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.

What It Does

The radiator transfers heat from the engine coolant to the surrounding air, keeping engine temperature within a safe operating range. On automatic versions, it often also cools transmission fluid through a separate internal circuit — one more reason the correct part number matters so much here.

Confirmed: A Genuine Safety Recall Worth Checking Your Car Against — Audi A4 Radiator

This is genuinely worth checking directly on related model years: a confirmed recall addressed water pump issues that could cause coolant to leak from the pump housing, with problems on this platform documented occurring anywhere from as early as 30,000 miles up to around 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 at the top of the bottle 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, overheating stems from warped cylinder heads or a weakened head gasket, frequently the lingering result of a previous overheating event.

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.

Audi A4 Radiator: Specs, Fitment & Common Faults

OEM Part Numbers

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Confirmed: A Genuine Safety Recall Worth Checking Your Car Against — Audi A4 Radiator