Liability Account

I have a liability account for a vehicle which has a balance outstanding. I have now sold the vehicle back to the dealer in exchange for a new one. The outstanding finance was settled and the difference was put towards the new vehicle, so the money hasn't physically come back to my account. How do I do clear the outstanding balance on the liability? I tried crediting it with the amount, however this seemed take off all of the vehicle expenses to date as well? I would be very appreciative of some help, Thank You 🙂