Assume Kimberly is calling AAA
AAA: "What can I do for you?"
Kimberly: "my car doesn't start, its engine doesn't work"
Kimberly: "my car won't start, I don't know why"
Are those answers both clear and natural?
I make up the context to understand the difference between "doesn't start" and "won't start". The former indicates Kimberly knows the reason/cause, the latter doesn't.
Is my understanding correct?