Diagnostic: Engine overheating on Citroën - Causes and costs
Engine overheating on a Citroën (C3, C4, C5 Aircross, Berlingo) shows as the temperature warning light coming on or the needle in the red. PureTech (petrol) and BlueHDi (diesel) engines share common causes with other PSA/Stellantis brands.
Citroën: common causes
On PureTech and BlueHDi, overheating is often linked to the thermostat stuck closed, radiator clogged or blocked, water pump failure, low coolant level (leak: hoses, head gasket, expansion tank) or fan (electric or viscous) not engaging. A heater matrix leak can also lower the level.
What to do
As soon as the temperature light comes on: reduce load, turn heater on full. If temperature does not drop: stop, engine off, do not open the cap when hot. Wait for cooling before checking level. Have the system checked by a professional.
Order of magnitude for costs
- Thermostat: about €80–200.
- Water pump: about €150–400.
- Radiator: about €200–500 (part and labour).
- Head gasket: about €800–2,000 and more.
- Fill and bleed: about €50–120.
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