Those engines (the Renault Energy) adocerate the topic cooling, either because the radiator is filled (people who wear water instead of antifreeze) and oxidize everything inside clicking the radiator and heating.
Or because the thermostat, or the water pump are damaged, if it is thermostat, the heating does work, what happens is that the engine is heated much more than normal because it does not pass water to the radiator.
Another thermostat paste is that it is open, so that consumption shoots (a long time with the cold engine) and apart that takes a lot to heat up and have heating.
The water pump if it breaks the water out, so if you do not lose it does not have to be wrong. The rare case that the turbine had broken and did not move the water could have been broken, but it is very rare.
The theme \ "Bubbles \" Well ... Renault has always been a punch to purge them, so it is possible that there is some air that does not end up evacuating. It is best to pressurize the expansion vessel (even if it is \ "loved the pylon and blowing \") and open the purgiers one by one until you see that foam or bubujitas does not come out.
If after having purged the sleeves they get hard and there is a presence of gases in butt, one of two, or the water boils or you have a problem in the butt joint or in the same cylinder head. (The fact that the Board is burn depends by the shoe that you give to the car and if you have given him any warm).
All the best.
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