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      08-15-2022, 10:01 PM   #2
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Drives: 2006 300i Sport 6MT
Join Date: Aug 2022
Location: Minnesota

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If you're sure you have the correct amount and type of coolant, and are 100% positive you followed the bleed procedure correctly, I would proceed to the next paragraph. If not, verify coolant and bleed procedure.

Is the electronic thermostat perhaps not opening? Maybe a weak water pump? There might be a code stored in the ECU if so... do you have a diagnostic tool to pull codes?
Have you ever mixed any stop leak in the cooling system?

Going past the electronic parts of the system, we could also consider that it could be burning coolant or mixing it with oil via a bad head gasket. But usually those are pretty obvious (white smoke from exhaust or milky looking oil), so we should probably focus on the rest of the cooling system first.
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