Old School Ghoul

Old School Ghoul is an unmarked quest in Fallout: New Vegas.

Activating the quest
Raul Tejada, the ghoul handyman found captive at Black Mountain, must be the player's active companion when the player initiates dialogue with Ranger Andy in Novac, Corporal Sterling in Camp McCarran (or Camp Forlorn Hope) and Loyal at Nellis Air Force Base. There is no set order to which NPC you approach first, but all three must be spoken to until their dialogue trees have been exhausted. At the end of each interaction, Raul will start a conversation with the player that revolves around both his observation of the characters and anecdotes about his history.

Quick walkthrough
The player must:
 * Be in neutral or higher reputation standing with the NCR or have an NCR disguise.
 * Speak with Ranger Andy in Novac.
 * Let Raul speak to the player about Ranger Andy. (He speaks when you leave the house)
 * Travel to Camp McCarran or Camp Forlorn Hope and speak to Corporal Sterling.
 * Let Raul speak to the player about Sterling.
 * Travel to Nellis Air Force Base or Black Mountain and speak to Loyal.
 * Let Raul speak to the player about Loyal.

Another way is, if you haven't already checked on Ranger Station Charlie, then doing so and returning to Novac will activate Raul's dialogue.

Detailed walkthrough
'''Warning: The dialog choices you make reflect Raul's decision, armor, new perk and ending, yet the issue where many players can't receive the final conversation even though they have gotten all three dialogs might actually be by design instead of a bug. If you choose neutral responses, it is possible that this is what causes the final conversation not to trigger, as Raul doesn't seem to make a decision at all. This is pure speculation at this point but seems to be the only viable answer to this issue of the final conversation not triggering.

Possible Solution: If you already listen to Raul story from the two people you have spoken, you can repeat the story again just by talking to Raul to hear the story about him and his family but chose a different dialog instead the answer you choosen. Once done, you need talk or listen to the final person again just like the first two. Once heard, Raul will come to talk to you just like the first two. So far. This was done on the Xbox 360 and it might work on the PS3 as well.

Talk to Ranger Andy with Raul present. The key topics are (at least on v1.02 for PS3) what he does in Novac ("what do you do here?"), and what happened to his leg ("Did something happen to your leg?" or "What happened?"). Raul must hear these answers, so you may need to repeat dialog you've already had with Andy. Learning the takedown move is NOT necessary, but doesn't hurt. After this, leave the building and wait a few seconds for Raul to run up to you and talk. Raul will initiate a dialogue concerning the player's opinion of Ranger Andy's place as a crippled, older man in a harsh world. The choices made by the player will influence which way Raul decides to proceed at the end of the quest ultimately affecting the player's reward. The player has an opportunity to hear part of Raul's story but may skip this portion of the dialogue at no penalty.

The player must then travel to either Camp McCarran or Camp Forlorn Hope depending on the completion status of the quest Three-Card Bounty. The player must speak with Corporal Sterling, a 1st Recon NCR sniper stationed with the rest of his squad at Camp McCarran, defending the region against fiends. If the bounties have all already been turned in to Major Dhatri during the quest Three-Card Bounty, his squad will have been reassigned to Camp Forlorn Hope. After initiating and ending conversation with Sterling, Raul will initiate a dialogue similar to the one held after learning the takedown move from Ranger Andy.

Upon completion of the first conversation, the player must travel to Nellis Air Force Base and initiate a similar conversation with Loyal. He can typically be found in either his own house or the hangar housing the bomber. After ending the conversation, Raul will initiate a final conversation wherein he ties the stories of the three men the player has met thus far to his own story. He will decide to either return to his gun slinging vaquero ways or relegate himself to a quieter life of machine (and armament) maintenance. The decision at which he will arrive is influenced entirely by the player's dialogue responses during the progression of this quest. However, the player has the opportunity to sway him to the other alternative with a speech skill of 66.

After completing the final dialogue, Raul will receive an upgraded perk. Old Vaquero if the player convinced him to return to the ways of his gun slinging past increasing his fire rate by 33%, or Full Maintenance if the player urged him to contribute in other ways increasing the reduction in weapon degradation that he provides from 50% to 75%. If Raul upgrades to the Old Vaquero perk, he continues to provide the Regular Maintenance perk. His outfit will also change to the Vaquero outfit or the Armored Petró-Chico outfit appropriately.

Bugs

 * After the quest Volare!, Loyal will travel to the vicinity of Black Mountain and can get stuck inside the mountains polygon mesh. He does not always go to Black Mountain sometime he can be found in the hanger around the bomber up on the scaffolding. PS3/X360 users should do this quest before completing Volare!, while PC players can help themselves with the console command.
 * Possible fix: Head to the hangar at Nellis during the daytime. Look around at the Boomers up on the scaffolding working on the bomber. One of them will be Loyal (if he doesn't appear right way, enter/exit a few times or come back after a day or so). You will have to jump and hit "A" to speak to him. (Or you can actually make it onto the scaffolding and also atop the bomber by jumping onto a table with some metal boxes close to the scaffolding and stand on the metal box, it is possible to jump up there in a few tries!). He will say something about how nice the bomber is, but will offer no further dialog options. Afterwards, walk away from the bomber and wait a minute. Raul will finish his tale and you can decide whether he should become a gunslinger again, or stick with fixing things, (speech check of 66).
 * Loyal may also remain at Nellis, and be working on the bomber, using VATS to locate him is recommended.
 * If you have already learned the Ranger Takedown technique from Ranger Andy in Novac without Raul present, you can correct this by using the console and typing the following exactly:  This *must* be done in an indoor area.  Transition to an outdoor area and Raul should initiate conversation. If that console command doesn't do the trick, try  and pick his dialogue option about Ranger Andy.
 * Worth a try if nothing else is working with the Ranger Andy/Raul interaction. If you have already completed all dialogue options with Ranger Andy, open the console command and target Ranger Andy . You can reset all his dialogue options by entering . Once you've done this, close the console and speak to Ranger Andy. He will now talk to you as if you'd never met, allowing you to trigger the Raul interaction, once you walk outside, if he is in your party.
 * Also, if you are not able to access Raul's story after speaking with Corporal Sterling, you can input a similar console command: . Again, if the previous console command doesn't help you can try and select the dialogue line about Sterling.
 * And, lastly, if Raul is making problems about not giving you the dialogue after meeting Loyal, you can of course use the console to fix that as well... will open the 'spontaneous' dialogue,  will give you the ability to talk to him - 'you wanted to say something about Loyal...'
 * Sometimes after speaking with the last NPC (Ranger Andy, Loyal or Corporal Sterling) Raul won't finish his dialog and allow you to choose between the full maintenance perk or the Old Vaquero perk. Simply quitting the game and restoring to an earlier save & repeating the dialog with the NPC should fix the problem.
 * For some reason Ranger Andy will not engage in dialog at all even though the HUD will zoom in to make it seem you will be able to but will then automaticaly zoom back out making it impossible to talk to Ranger Andy.
 * Some players have reported being unable to talk with Corporal Sterling. He only replies with a generic line without opening dialogue if he is stationed at Camp Forlorn Hope. This may be fixed by spawning Driver Nephi and letting the rangers kill him ("player.placeleveledactoratme 000f56ff").
 * For yet unknown reasons it is possible that talking to Ranger Andy in Novac does not trigger Raul to speak to the player. Making it impossible to start the quest even if you have not learned Ranger Takedown prior to having Raul with you. Note: this bug may be corrected on the PC version by using console commands. See the section marked "Quick Walkthrough" for details.
 * After Patch 1.02 it is now possible to initiate the quest by talking to Ranger Andy after learning the Ranger Takedown Move, though you must still have Raul as a companion at the time.
 * Raul doesn't start the final conversation after talked to all 3 Characters and receiving all 3 regarding dialoges from Raul. To avoid this, the player must not talk to Loyal after completing the quest Volare!, when he thank you for making his dreams a reality; can't initiate the side-quest I Don't Hurt Anymore AND talk to Corporal Sterling; can't talk to Ranger Andy prior to having Raul as a companion. After having Raul as a companion you can talk with Loyal, Corporal Sterling and Ranger Andy in whatever order you want, as long this conditions are fulfilled. This was tested in three different playthroughs.
 * In numerous cases after completing "Volare!" Loyal will disappear from the game completely. A lot of the fixes such as finding him near the bomber in the scaffolding or waiting at his home will not work. In this case the only fix for the situation is to use console commands on the PC version. The Xbox and PS3 version will not be able to complete this quest.
 * There is a case that if you fast-travel right after exiting Ranger Andy's Bungalow, Raul's dialogue option will not be triggered. Just wait a minute to see if you get the trigger.
 * After having already learned the ranger takedown perk & initiating Raul's dialogue with the other two characters & then applying the 1.02 patch, Raul will still not initiate his third dialogue after exhausting conversation topics with Ranger Andy, making the old school ghoul quest impossible to finish.