I recently bought a second hand Kia Carnival 2003. It looks great but had some few defects that had to be fixed like the speedometer and some scratches. Two days later, it's emitting black smoke and engine seemed to lose power as it couldn't even run in reverse in a slightly elevated road.
I had it checked by the mechanic and it turned out that the engine was totally defective and all sorts of remedies were made just to get it running. Now, the car is still being repaired and has been there sitting for a month already. I have already spent 50K for the repair and labor and has not yet completely been repaired.
What can I do to make the original owner pay for all the hidden defects? Please advise.