The radiator makes unbearable noises throu out the night, which drives her insane. We think that this is due to air pockets in the pipes, we can hear crackling and water drops.
The heating system is common to the whole building, and I cant turn off hot water.
How do i open this shit
You need the radiator key to bleed the air out of the system. Since you said this is common throughout the building I recommend you don’t touch this at all and let the building owner handle the issue.