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Been through this a few hundred times
Probably cylinder number four. Pull the plugs after the car has been sitting and you will probably see water inside there.
The heads usually crack near the exhaust valve on cylinder 3 or 4.
Forget having it fixed, find a good used head. I don't care what anyone says, I have never seen a repair on one of these heads last. I think it has something to do with the alloy.
I can't remember ever having one that was just the head gasket. Sorry.
I have been an ACT certified BMW Tech since 1994.
Furthermore, what happens when these cars overheat, is the head warps and pull the bolts out of the block.
The cast iron blocks usually survive this, the aluminum ones, usually not.
If you have the aluminum block, I would loosen the head-bolts, and re-torque them to see if the threads in the block hold. Then, pull the head, replace, and be on your way.
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