F10 530d owners - quick favour if possible

[Dog Biscuit]

2015 f10 530d 45k miles.

My coolant return flow seems to have a repeating rhythmic pulse in the flow at idle.

Car runs, idles and performs perfect. No cooling issues and no loss of coolant

Can anyone else check theirs to see if it's the same?

It repeats every 4 seconds without fail - so it makes me think it's 'normal' with some sort of valve or something pulsing rather than a failing pump or whatever



https://youtube.com/shorts/IP9InA4Gi9Q?si=M4GFS0jq...

Many thanks in advance

Edited by Dog Biscuit on Monday 30th December 16:25

[AlexGSi2000]

I renewed the coolant on my 2015 530d a few weeks ago.

When observing the levels after filling / bleeding - mine behaved the same.

[Dog Biscuit]

Lovely thanks for the reply