There vaults a pretty much in the same section as each other, just spread out a bit.
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There are 7 vaults as follows: Vault 87 Vault 92 Vault 101 Vault 106 Vault 108 and Vault 112
Vault 112 is in Casey smiths garage once you activate the electrical switch and you will have the doors into the basement open and then you get into Vault 112 and are spoken to by a robo-brain or whatever, and you go into the machine after you change into the Vault 112 vault suit.
you have to go through little lamp light & enter vault 87 though an auxilury exit u have to save 3 kids from Paradise falls to get in though and u have to sound the fire alarm in vault 87 to free Fawkes who u follow till he gets it for u
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You need to do the "Trouble on the Homefront" quest, anytime 'after' you complete Project purity, you need to get yourself within Radio reception distance of Vault 101, Megaton for instance, and you will hear the Vault 101 distress signal on you Radio, listen to it and you will then know what to do.