[NigelK]

What temp is it getting to when it bubbles ...... or does it start bubbling when cold, immediately on start up.

 

[NigelK]

And was it doing it before you changed the expansion tank? Is it a standard Original Equipment one you've fitted or on of the metal afermarket efforts?

 

[NigelK]

And if you aren't on it or have not heard of it I advise you to join the R53 Owners Club on Facebook. Now up to 6,800 members, all with Gen 1 Cooper Ss - R53s. So it is a tad more focussed than this very generalist forum. It is very active, heavily admined (think there are currently 22 or 24??) so none of the usual nonsense you can get on FB groups.

R53 Owners Club | Facebook

Based in the Uk a group for R53 Owners, but owners from around the world welcome. We also have R50/R52 owners on board too :) Group is for sharing information, selling stuff, arranging meets and...

www.facebook.com