Bleeding radiators

[softyengin]

Good morning, I just have a quick question for you. I have a Greenstar 28i Junior combi boiler.

I recently bled all my radiators as they were making a loud gurgling noise when they were on.
I had to add more water to the system twice during this process.

The issue is it's still gurgling but i've been around all the radiators and they are all fully bled so is there another place i have missed.

Like at the boiler itself.

Thanks for your advice.

ps should i be adding any anti rust solution, if so how would i add it? ta

[plumbbob]

The boiler should have an auto vent so will be self bleeding. If you hear gurgling noises it is usually air trapped in the pipe work at bends where the flow is downwards. Normally over a period of time it ends up in a radiator where it can be bled off.

You should always add rust inhibitor to modern heating systems to help protect the boiler heat exchanger.

Normally you add it into an empty radiator before filling the system. You can buy injection kits, but they do cost more.