Ok so Ihave a 1998 blazer ls when i put it in 4x4 the transfer case locks but the front diff does not i found the actuater under the batery and the cable moved freely and i can hear the front diff locking so i took the vacume line off and started it and no vacume in 2wd or when i try to put it in 4wd still no vacume.. Where does the vacume hose go????