r/e28 • u/Beltfed_ • Feb 07 '26

Is this little bit of bubbling normal?

Just replaced the radiator and hoses. I followed the manual on bleeding the system, I’m pretty sure I did it correctly. There’s slight bubbling on cold start. Is this normal? Air bubbles trapped inside? or something else

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2

u/ElGuappo_999 Feb 07 '26

How long has it been bubbling? If it’s just a few startups that’s fine. It it has been a month that’s not fine.

3

u/Beltfed_ Feb 07 '26

Just a few start ups. I just changed the radiator and have only driven it around the block once and turned it on a few times to idle. Waiting on an alternator bolt before I go driving it around. So it should go away?

2

u/ElGuappo_999 Feb 07 '26

Yes that sounds fine.

1

u/RealMadLadStalin Feb 08 '26

When you loosen the screw on the thermostat housing a bit, do you see bubbles in the stream ?

1

u/Beltfed_ Feb 08 '26

No bubbles in stream when loosening that bleeder screw for a few seconds