How to Sell a Car If You Are Upside Down on the Loan – This is a place for the community to provide tips and advice on How to Sell a Car If You Are Upside Down on the Loan. This topic was created by Catherine Jelski and the tips are provided by the community. The tips you add here can be your own or referred from another site. The best tips are then ranked at the top when up-voted by members of the community.