chkconfig yum on function?

[Barry Yu]

In FC5, I used chkconfig yum on, and verified with Administration->Server Settings->Services that yum service is on, I rebooted system and after 1/2 hour, used yum check-update, displayed a long list of items need to be updated - Seems yum auto update is not functioning at all. Next day I yum check-update again but still a long list of items to be updated.
How do I know yum auto update is working? In addition to chkconfig yum on, do I have to do anything else to make it work?
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