Q: cooling system not working prpperl, ,leaks coolant ,smokes too much? on 1995 BMW 525i

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my car produces too much exhaust smoke every time i ignite it and continues for over a mile of also leaks coolant and overheats too fast.mechanic does not seem to be able to fix it.Help please!!!!!!!!!!!!!!!!!!!
(1) Answer
I'm guessing blown head gasket. if your mechanic isn't a BMW specialist, find one. No excuse for not knowing what is causing the symptoms if he has BMW experience and has the car in front of him.
If you want to find a specialist, here's a directory link for you: