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Audi A3: Water pump and thermostat housing coolant leak (8V A3 1.8/2.0 TFSI EA888 Gen3)

Water pump and thermostat housing coolant leak (8V A3 1.8/2.0 TFSI EA888 Gen3) is a common cooling fault on the Audi A3 on the 2013–2020 cars, and we rate it major. Putting it right costs $900 to $2,000 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 43 documented faults on the Audi A3.

Vehicle
Audi A3
Engine
1.8L / 2.0L
Years
2013–2020
Fuel
petrol
System
Cooling

This page covers the Audi A3 as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Audi A3 faults43 documented faults on this model

What you are looking at

An annotated photograph of an automotive engine thermostat identifying the wax capsule and both disc valves.Example of the part — not this vehicle

A double-valve engine thermostat, labelled: the wax capsule is what sticks.

Dougsim · CC BY-SA 3.0 · Wikimedia Commons

What goes wrong

On the 1.8 and 2.0 TFSI Gen3 EA888 in the 8V A3 the water pump and thermostat are a single plastic module bolted to the block and driven off the timing chain. The plastic housing goes brittle with heat cycling and cracks, or the thermostat sticks, and the module has to be replaced as a unit. It usually announces itself as a slow coolant loss with no obvious puddle, because the leak runs down the back of the block and evaporates on the way. Ignored, it becomes an overheat, and on an aluminium engine an overheat is a far larger bill than the pump.

What you would notice

  • Coolant level dropping with no visible puddle under the car
  • Temperature gauge slower to reach normal, or wandering once warm
  • A sweet coolant smell after a drive
  • Coolant or dried residue visible low down at the back of the engine

How to check it

Where to look. Rear of the engine block, driven off the timing chain — the combined pump and thermostat module

  1. Check the coolant expansion tank level against the marks with the engine cold, and look for crusty white or pink residue around the pump housing at the rear of the block.

  2. Ask whether the water pump has been replaced and at what mileage.

  3. On a car of this age an original pump should be treated as a pending expense.

Parts involved: Thermostat, Water pump.

What it costs to put right

$900 to $2,000 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

  • “Has the water pump or thermostat module been replaced?”
  • “Do you ever have to top the coolant up?”
  • “Has it ever overheated or been driven hot?”

Now check the Audi A3 you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

Audi A3 buyer questions

Is water pump and thermostat housing coolant leak (8v a3 1.8/2.0 tfsi ea888 gen3) serious on a Audi A3?

We rate it major and common on the Audi A3. On the 1.8 and 2.0 TFSI Gen3 EA888 in the 8V A3 the water pump and thermostat are a single plastic module bolted to the block and driven off the timing chain. The plastic housing goes brittle with heat cycling and cracks, or the thermostat sticks, and the module has to be replaced as a unit. It usually announces itself as a slow coolant loss with no obvious puddle, because the leak runs down the back of the block and evaporates on the way. Ignored, it becomes an overheat, and on an aluminium engine an overheat is a far larger bill than the pump.

How much does it cost to fix on a Audi A3?

$900 to $2,000 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Audi A3 years are affected?

Our research records this fault on the 2013–2020 Audi A3. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

Check the coolant expansion tank level against the marks with the engine cold, and look for crusty white or pink residue around the pump housing at the rear of the block. Ask whether the water pump has been replaced and at what mileage. On a car of this age an original pump should be treated as a pending expense. Look here: Rear of the engine block, driven off the timing chain — the combined pump and thermostat module