When you refinance a car loan, you get a new car loan to pay off your old car loan, often at a more favorable rate. Assuming that you have maintained a decent credit score and you still have steady income, you should qualifiy for refinancing.
Like with any other type of loan, the key is to shop around to make sure you can find a better interest rate. But because interest rates have fallen, you should likely be able to find a better deal.