If you refinance a car loan to a longer term, you may experience lower monthly payments. However, you could end up paying more in interest over time.
Do not pay off car loans with home equity loans
You will be borrowing against the value of your house while extending the term of the auto loan, which will likely extend beyond the life of your vehicle.
Are there any prepayment penalties with your current loan?
Be sure to closely read your original loan documents to determine if there are any prepayment penalties should you choose to refinance. Any penalties/costs should be included in your refinancing evaluation.