Your heating making a noise when it comes on could be down to several different things. It could be due to the heating system itself, or it could be a symptom of something else. Common causes could be the expansion and contraction of parts from rapid heating and cooling, worn fan blades, a loose or damaged fan belt, faulty wiring, a clogged Solution. #4. Much depends on the actual noise being made ( I can only make assumptions that my experiences of the 'sounds like' noises are similar to yours ). It likely is air and cavitation - the noise made by the pump impeller when air is being introduced into the coolant as it runs. Yes, some water heater hissing sounds are an indication of a bigger problem that will, unfortunately, require repair or replacement of your water heater. However, there are some reasons why your water heater may be making a hissing sound that is completely normal or only requires a small fix. We take a look at each of the reasons why your hot yjaOvJT.

is it normal for radiators to make noise