The real deal y0
Which is why they are asking for advise/information here though. Youre not wrong in what youre saying, but if you tell people about whats going on, what helps, and what the risks are, they can make their own choices. And if they fuck up, they will learn their lessons.
I have faith in humans to make relatively ok choices. Exceptions exist, but they wouldnt be on lemmy nor would they ask for information first :')
Oh valid point. Dont unscrew the whole valve haha. Only the slotted key hole!
Steam might come out if you have a very major pressure issue or water temprature is way way too high. Either case, slowly opening the valve solves all off that
Dont over react. If you know to turn the valve slowly you are fine.
- ex large building maintenance guy
I have no idea why everyone here is saying to not do jack shit. Like, is the us system so different than what im used to?
Here is an information dump of what i know, and what my experiences is from 9 years of being the handyman in an elderly home. And yes, i called in experts enough times on heating issues. I know my ( local ) shit.
Would you describe the sound like a knocking, rumbling sound? If so, turn it all off, check the pressure of the heater and get a plumber. Youre pushing steam or nothing through the system and the piping doesnt like it. Scary sound if its bad tbh. Also a serious issue you need a plumber for, as the heater or preassure tank is likely fucked.
Would you describe the sound like blub blub, airbubbles popping or a waterfall? If so, there is air in the closed loop of the radiators. It happens, and its recommended to check all radiators once a year when it gets colder. Nothing bad about it, easy to fix/remedy.
You can also validate this by turning on the heating system and noticing, on top of the sound, that only part of the radiator heats up.
This is usually a problem with the highest radiator of your system, or the farthest radiator of your loop.
If it happens more than once a year -> you might have a leak somewhere ,if water pressure remains the same, get a plumber to check on the system or radiator system.
The later can easily be remedied. Go to the radiator that makes sound and try and find the following : 
It is an release valve intended to let air in, or out, of the system. It is on the top side of the radiator, on the opposite side of the knob. Turn on the heating system, wait a bit for it to heat up. Then use the special key, or screw driver to very very slowly turn it open. You will hear air escape at one point, or drips of water coming out of the small hole you see in the picture. If you can no longer hear air escape, or a steady small stream of water comes out, all air is released and you can close it again.
Alex horne? But why? Greg davies is so much better :')
Right, so basically he removed the software aspect in his tests which removes systems to protect the battery. I assume without them, it is damaging, like what great scott found.
Ye, he should have continued his experiments then!
Ok, before i watch the video, no damage is not what great scott found from his testings… ( https://youtu.be/iMn2yVoEqPs ).
so i have no idea what to believe anymore, but my (based) experience is that it does damage it. Ill have to watch later.
Whoa, what the hell? Id like to know more if true!
EDIT: what the actual living hell???
https://www.reddit.com/r/Brooklyn/comments/1gjdpug/someone_explain_to_me_how_radiators_work_in_nyc/