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Mercedes-Benz · Electrical, Sensors & Modules

Coolant temperature sensor

The sensor telling the engine management how hot the coolant is. It drives the fans, the fuelling and the gauge.

Also called ECT sensor, temp sensor.

How you know it is this

  • A temperature gauge that reads wrongly or not at all
  • Fans running constantly from a cold start, or never running
  • Poor cold starting and heavy fuel consumption
  • An engine that takes far too long to warm up

Worth knowing before you buy

  • Cheap, and it causes symptoms that look far more serious than they are.
  • A sensor reading cold makes the engine over-fuel permanently, which shows up as economy before it shows up as a warning.
  • Some engines have two — one for the gauge and one for the management. A fault on one does not affect the other.

What we need to quote it. The engine code and the fault codes. The chassis number settles the generation, the body and usually the engine in seventeen characters — it is on your mulkiya. A photograph of the old part helps where there is more than one version.

RadiatorExpansion tank and capUpper and lower hosesThermostat and housingWater pumpAuxiliary pumpFan and clutchShroud and mountsHeater matrix and valveHeater hosesPipes and flangesTemperature sensorAuxiliary coolers
Cooling circuit — schematic, to show where the part sits. Arrangement is right; it is a diagram and not a fitment reference.

Rest of the engine sensors

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Get in touch

Coolant temperature sensor for your Mercedes-Benz?

Send the chassis number and a photograph of the old part. We come back with genuine, OEM and aftermarket options priced side by side, with lead times.

Mon–Sat, 8:00 AM – 6:00 PM · +971 54 303 3119 (Operations Director) · +971 54 241 0599 (Managing Director)