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Lion Yard Trading
Mercedes-Benz · Cooling

Thermostat and housing

The valve that stays shut until the engine is warm, then opens to let coolant through the radiator. Usually in a plastic housing.

How you know it is this

  • The engine taking a very long time to warm up, or never reaching normal
  • Overheating with a cold radiator — stuck shut
  • Poor heater output and heavy fuel consumption
  • A leak from the plastic housing

Worth knowing before you buy

  • Stuck OPEN is the quiet failure: the car runs cold, uses more fuel and wears faster, with no warning light. Stuck SHUT is the loud one and overheats in minutes.
  • The housing usually cracks before the thermostat fails, and on most engines they are supplied as one unit.
  • Cheap, and worth doing with any radiator or pump job because the system is drained anyway.

What we need to quote it. The engine code. 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 pumps, fans and thermostats

All cooling parts
Get in touch

Thermostat and housing 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)