So you currently have a car pmt of $1K mo until Oct 2018?
At 29.99%, which has to be the max loan percentage allowed legally I would guess.
This is clearly a straightforward math question and I'm terrible at math, but my calculator tells me you would save 17.99% in interest for 6 mo if you can refinance next month at 12%.
So yes, do it - your hair is on fire with a debt emergency, so you do whatever it takes to get that monkey off your back. If it will save you money - do it.
Be sure you know what costs are involved for re-financing and make sure you look up your credit report to see if that dealer/bank/loan co. is actually reporting your loan and your on-time payments - otherwise it may all be for naught (if you are trying to repair your credit).
However, in order for us to give you truly useful advice - you might give us more pertinent background information. Is your loan for a $5K car or more? Is having a car truly essential?
If you follow Dave Ramsey's snowball debt method then I'd think this one has to be up top on the list for the highest interest rate - to be paid off first.