Bonjour,
I have bought a small 5 cl syringe with its needle at my pharmacy. Putting the needle which is about 6 cm long and 0,8 mm wide at the bottom of the central tube, a drop, a launch, another drop and so on until the water does not disappear and escapes from the radiator. I took me long minutes to fill it correctly I hope.
Raphael, thanks for your inputs...I will try and be more patient while filling...might be I was just forcing too much water in the radiator and it could not take it that fast.
cheers,
Roger