What are the best BMW repair shops?
RepairPal Certified shops can diagnose and repair your 2006 BMW X3. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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I changed that filter first. Nothing changed. Then took it to dealer, they said water is not running and they had to clean it. They did this twice for $200 each time and still smell is there. I found a can of cleaner in BMW site (looks like they have this problem common) I will order but don't know where to put that. Into the vent system from inside or on the engine side. Everything is tight closed in engine. Now dealer says they will change the heater box for $2000. I am not convinced it will solve the problem. Thanks for your suggestion anyway.