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Expansion Tank Boils Over During Bleeding

1218 Views 3 Replies 2 Participants Last post by  jonesin
I was bleeding my 1996 328i today after I drained the radiator plug and put in new coolant. I let the car run for 15 mins, then the expansion tank was boiling the coolant while the bleeder cap was slightly opened. I turned the car off and then I checked the oil and it looked very normal. There is also no leaks at all and the exhaust is not bringing any smoke out. (I am using 50/50 BMW Coolant). LMK what the problem is or could be. Thanks
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Air is trapped in the cooling system.

It isn't boiling, the air is escaping.
Whats the right way to let the air escape? BTW thanks for the comment jonesin.
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