Alde 3210

golfneil

taken delivery of a new van. The alde expansion tank does bubble a lot when the heating is on. Much more than my 2012 van that also had Alde heating. Can't think what I could do to calm it down  I can live with it but if it could be made quieter that would
be a result  lol

Any ideas before I contact my dealer/Alde  please. I can't find any reasons on the web  

Many thanks for your thoughts and ideas , much appreciated. 

Neil.