If it is a cashiers check...find the bank it is drawn from, and cash it.
Once you have the cash, release the car.
I don't know if any of the US banks have branches in Central America, so you might want to do a search. Maybe that country has a chamber of commerce website?
I believe you told me the buyer wants to use it for Taxi service. Sounds reasonable, as we all know that Diesels are a popular choice for this kind of operation.
There was a member who posted his dealings with one of the fake buyers...the kind that were playing the money transfer game...but I think that scam artist wanted to know the bank account numbers of the seller. He hasn't asked you for those, has he?
"...rationality of thought imposes a limit on a person's concept of his relation to the cosmos." -Nash
04/71 280SE 195k
09 Jetta TDI