If there is a noticeable temperature difference between the upper and lower parts of panel radiators, this means there is an air lock that needs to be eliminated. In the case of cast iron radiators, some sections may be warm and others cold, or the entire radiator may remain cold. The presence of air is also indicated by a characteristic gurgling sound.

How to properly bleed air from a battery:

First of all, you should remove the carpet or other things from the floor near the radiator. It is advisable to put a rag or disposable napkins under the radiator, and place a small container or a cut plastic bottle under the ventilation hole. Next, you need to carefully open the ventilation valve on the radiator to release the air. You will clearly hear the air coming out, and when this process stops, you need to close the valve.

If you have independent heating, be sure to turn off the boiler and stop the water supply and return from the radiators before releasing the air. Using a special key, gradually open the air bleeder until water begins to flow through it, after which you can close and fully open the water supply and return lines.

If you cannot solve the problem yourself, contact a plumber who will help release air from the batteries and restore the normal functioning of the system.