I have been trying for same for a 2004 Sorento. Kia tell me they only give to dealers!!!!!! They wil not sell to me!!!! Have scoured the net to no avail. If you discover anywhere that will supply Kia workshop manuals please post. Thanks
I don't know of anywhere for an actual manual, but the kia technical website( the one all dealers use for online technical data / manuals / wiring diagrams) has a section for independant repairers to log in and get technical data.
The website is ...kia-hotline... they do charge but it may help you out if there is something specific you need.