Watermota.Ro — Cooling System Liquid Level Check and Replacement

For these Watermota.Ro models: CM4.33, CM4.42.

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Procedure

1. Always verify the level of the cooling fluid when the engine is cold.
2. Open the filler cap on the expansion tank (if fitted) or else the filler cap on top of the housing of the heat exchanger and make sure that the coolant level is about 1 cm below the bottom of the filler pipe.
3. If so required, top up with fresh cooling liquid.
4. To replace coolant, remove the two drain plugs of the cooling system from the engine block and the housing of the heat exchanger.
5. Remove the filler cap from the expansion tank (and/or the heat exchanger housing), in order to quickly drain the liquid from the internal cooling circuit and to make sure that all of the liquid has been discharged from the engine.
6. Replace the drain plugs and tighten them well.
7. Before filling in the fresh coolant, remove as well the bolt on top of the cover of the thermostat housing. This enables the cooling system to be vented (air-bled).
8. Fill the system with a mixture of 40% of anti-freeze and 60% of clean tap water.
9. Top up to a level of about 1 cm below the bottom of the filler pipe.
10. After the engine being commissioned for the first time, i.e. has warmed-up and cooled down completely thereafter, check again the coolant level and top up if necessary.

Source: manual:CM433_CM442_manual_web_EN.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.