Is the door open? It says business hours to be determined

Hello; The Yellow Emperor's Mausoleum will be closed in mid-March, probably because of the Qingming Festival. The Yellow Emperor Mausoleum Cultural Park is composed of the Yellow Emperor Mausoleum, Xuanyuan Temple and the Chinese Ancestor Hall. Now you can visit the Chinese Ancestor Hall and Xuanyuan Temple. Hope my answer can help you.