I'm very interested in this, I'm taking my car(2010 328i) in next week for a new heater core. It's under CPO warrant, which is great, but I still don't fancy having them completely dismantle the dash and interior. What I don't understand is that I purchased the car with 13,000 miles on it, now I have 28,000. I have flushed the cooling system this year with a 50/50 mix of BMW coolant and distilled water. Prior to that, the cooling system had never been serviced, so whatever it is being filled with from the factory is whats causing the heater core blockage.
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