Is it normal for radiators to make noise?

Online Answer
A gurgling noise is one of the most common complaints people have about their radiators. As your boiler pumps the hot water around the radiators, it is possible for air to become trapped in the system. Over time, if this air isn't removed, it can cause issues such as gurgling noises and cold radiators..
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You need to shorten the curtains if you aren't going to accept NOT tucking them behind the radiator, even though it's wasting heat..