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Stock Problems/IssuesDiscussions related to warranty related issues and repairs, or other problems with the OEM parts and software for MINI Cooper (R50), Cabrio (R52), and Cooper S (R53) MINIs.
then I'd suspect a blocked a/c condensate line. Find it under the car (you know where one end is) and blow it out with air, vac with a wet vac or run a wire up there . . . .
Busted heater core....that's what your replacing right. I blow air through the heater hose lines on the other side of the firewall before heater core removal.