Hi Leutz, After filling in about 0.5 l of cooling water on 5tkm in the meantime, and I no longer come to take the bluish green deposits in the area of the heating box, I will probably not be able to push myself all too long to change it. As soon timing belt changes are in place, one could do this in a wash up, since then the cooling water has to be out anyway. However, I have read the instructions from a forum member here, since the och no longer soooooo endlessly eager to do this to me. However, the instruction was also for an Omega B, not for an A-model. What does it look like, is that exactly the same for the Omega A…eiden, or is it perhaps a little easier? Gruss, Pierre