Q: how hard is it to replace the A. C. core ? on 2006 BMW 325i

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The A. C. has quit working and I can smell the refrigerant inside the car.
(1) Answer
The entire dash has to be removed, to replace the Evaporator Core. For a repair shop to replace it, the estimator shows 14 hours to replace. For a DIYer, figure a long weekend or more!

Also when done, the a/c system needs to be evacuated and recharged.