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Lion Yard Trading
Mercedes-Benz · Cooling

Expansion tank cap and level sensor

The cap itself, and the float sensor in the tank that puts a low-coolant warning on the dash.

How you know it is this

  • A low coolant warning with the tank visibly full
  • No warning at all when the level really is low
  • An intermittent warning over bumps

Worth knowing before you buy

  • A float sensor sticks with scale and age. A warning that comes and goes over bumps is the sensor, not the level.
  • Often supplied with the tank rather than separately — worth checking which before ordering.
  • Never ignore a real low-coolant warning here. Topping up without finding where it went is how an engine is lost.

What we need to quote it. 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 radiator and circuit

All cooling parts
Get in touch

Expansion tank cap and level 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)