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Instructions for replacing the thermostat

Model: Mercedes Classe C W203 - Years 2000-2007
Part: Thermostat

Locate the thermostat in the engine compartment; for reasons of convenience, remove the plastic bulkhead near the cylinder head cover. Initially it is necessary to empty the cooling circuit by means of the drain located behind the front bumper at the bottom right in front of the car: to do this, connect the drain outlet to a sufficiently large tank (7 liters) through a plastic tube; then open the drain by unscrewing the dedicated control, so as to allow the coolant liquid to flow into the can. To facilitate release, keep the contact panel on and the internal heating controls set as if it were to emit hot air. At this point, acting on the plastic tube (made up of two sections) of the thermostat, release the metal sealing ring and detach the lower part of the tube. Now unscrew the two screws that secure the upper portion of the tube to the engine block and then, pulling it outwards, remove the thermostat. Therefore, take the new spare part which will be equipped with the two gaskets necessary for assembly, a cylindrical one to be applied in contact with the plastic pipe and a square one to be applied near the metal valve. Now insert the new thermostat in the engine block by performing the reverse procedure, tighten the screws of the upper tube and insert the latter by interlocking with the other portion of the tube. Tighten the sealing ring. Returning to the underbody, close the bleed control by screwing it and fill the coolant reservoir up to the "max" mark by closing the relative cap. Finally, reassemble the plastic bulkhead disassembled at the start.


Posted on 26 June 2023 by ScegliAuto



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