You gave me a lemon which has mechanical failure in the first place on [date]. I am not a mechanics so I do not know why it [stopped / overheated] in the middle of the highway. I did not crash or cause any damage to the vehicle in any way.
If anything, I should be claiming you for endangering my [family's] safety in your vehicle. I should also be claiming you for leaving myself / my family stranded dangerously on the side of the highway waiting for a replacement which did not arrive until [time].