Bubbling expansion tank [Archive] - Audi Forums

: Bubbling expansion tank

05-01-2017, 02:38 AM
2001 B5 1.8. Noticed that there is some sort of bubbling occurring at the top hose in the coolant expansion tank. Just had the coolant flange replaced (thinking of going aluminum next time if it fails again). Thought that might fixed it but it didn't. Any idea as to what the reason is?