Where is the claptrap in Old Haven?
Answer Take Two:
The claptrap that you rescue from the cage (The one that you already found) will make the one that will appear where you are looking appear. You must continue to progress along the quest line until you get to the quest that specifically asks you to go save the caged claptrap. After that is done, a nice blue claptrap will appear in that room leaking its last squirts of oil!