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Hi all, I did some work today replacing parts of the cooling system on my 320cd consisting of new waterpump, thermostat, expansion tank and radiator etc.

After putting everything back together I noticed water was dribbling out of the hole as highlighted on the radiator. This is where a piece of the expansion tank mounting seats into the rad.

After taking it apart again I noticed there was no O-ring on this plastic piece of the x-tank that seats into the rad.

My question is should there be an o ring on this?
I could not find one that may have fallen off when dissasembling the old rad.

Thanks for any help!

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