User blog comment:Merindon1Delicia2/Skyrim Dawnguard Vampire Quests Bugs/@comment-82.39.80.132-20150330193312/@comment-6881629-20150330194333

The entrance isn't where the marker is for some reason go to the Dayspring Canyon page and click on the map the entrance is around where the player marker is (and your looking for a crack in the mountain).