This is your boundary. Stick to it. Why does HE need to take the car in to get a quote? Are you not capable of doing same? That is a bit rhetorical, although is there some reason he needs to be the one to do that?
Simply respond that you are considering what he is asking and you will let him know when you have had a chance to think about it. Do not respond to any further email about this specific issue.
Keep everything that he emails regarding this as documentation. As he continues, what the courts will see is your valid response and then his harassment over same. That IS what he is doing.
I am not a lawyer, what I am sure of is, the courts will see his actions for what they are.
