I did a co-signed a car loan but it has not appeared on my credit at all?

It sounds like you are trying to build your credit through your co-signer transactions. You can call the company and ask them to start reporting, but beware: as the co-signer if the primary signer becomes delinquent this will also be reported. There is a great article about co-signer liability here: http://personal-debt-management.suite101.com/article.cfm/understanding_cosigner_liability