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Peugeot 3008: PureTech 1.2T Thermostat Housing Coolant Leak

PureTech 1.2T Thermostat Housing Coolant Leak is a common cooling fault on the Peugeot 3008 on the 2016–2021 cars, and we rate it major. Putting it right costs $350 to $750 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 23 documented faults on the Peugeot 3008.

Vehicle
Peugeot 3008
Engine
1.2L
Years
2016–2021
Fuel
petrol
System
Cooling

This page covers the Peugeot 3008 as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Peugeot 3008 faults23 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

The plastic thermostat housing on the EB2DTS PureTech engine is prone to cracking at the outlet pipe junction and at the housing body itself, causing external coolant leaks. The housing is exposed to significant thermal cycling and the plastic formulation used in early production is insufficiently robust, leading to stress fractures after 50,000-80,000 km. Peugeot revised the housing material in later production but the updated part must be fitted to pre-revision vehicles as a repair.

What you would notice

  • Coolant puddle or drips under the vehicle on the driver's side after parking
  • White residue or lime-scale deposits around the thermostat housing body or hose connections
  • Gradual coolant reservoir level drop over weeks with no other visible leak source
  • Temperature gauge reading higher than normal or fluctuating at idle
  • Coolant smell from the engine bay, particularly when the heater is running

How to check it

Where to look. Left rear of the engine block, near the firewall on the PureTech 1.2T engine

  1. Inspect the thermostat housing body and all coolant hose connections for white or crusty lime-scale deposits indicating a weeping leak.

  2. Check the coolant reservoir level when cold and look for a gradual drop over time without any other identified cause.

  3. Run the engine to temperature and re-inspect the housing for any fresh wetness or steam.

Parts involved: Thermostat.

What it costs to put right

$350 to $750 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 thermostat housing been replaced, and with the updated Peugeot part?”
  • “Has the coolant ever needed topping up between scheduled services?”
  • “Are there any white deposits or staining visible around the coolant hoses at the back of the engine?”

Now check the Peugeot 3008 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.

Peugeot 3008 buyer questions

Is puretech 1.2t thermostat housing coolant leak serious on a Peugeot 3008?

We rate it major and common on the Peugeot 3008. The plastic thermostat housing on the EB2DTS PureTech engine is prone to cracking at the outlet pipe junction and at the housing body itself, causing external coolant leaks. The housing is exposed to significant thermal cycling and the plastic formulation used in early production is insufficiently robust, leading to stress fractures after 50,000-80,000 km. Peugeot revised the housing material in later production but the updated part must be fitted to pre-revision vehicles as a repair.

How much does it cost to fix on a Peugeot 3008?

$350 to $750 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 Peugeot 3008 years are affected?

Our research records this fault on the 2016–2021 Peugeot 3008. 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?

Inspect the thermostat housing body and all coolant hose connections for white or crusty lime-scale deposits indicating a weeping leak. Check the coolant reservoir level when cold and look for a gradual drop over time without any other identified cause. Run the engine to temperature and re-inspect the housing for any fresh wetness or steam. Look here: Left rear of the engine block, near the firewall on the PureTech 1.2T engine