This kind of noises produced gas in cooling system.
In the old coolers never heard sounds like streaming water because the compressors were very loud due to high pressures (12 bars or more), which were required for efficient cooling. Today we use more ecological gases which work (from 5 to 6 bars) at much lower pressures, thus compressors produce much less noises and now suddenly we hear sounds that never before heard. Generally speaking noises is lower, measured in decibels.
Dado
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