Given the fact that in those days having an animated fan on the back of the armor would have been incredibly difficult to impossible...
Do you really believe that?
If it was a fan, couldn't they have just changed the position in the frames of the idle animation? Its trivial.
~Now... that mentioning of a 60,000 watt fusion power pack (on the T-51b) makes me lean a bit more towards it being the radiation symbol.
the only evidence we have is the fact some of the original fallout design team worked on New Vegas.
Can't ask them now... They've released it with a fan in NV.
**It just sounds like someone's, "Can we make that a spinning fan?" suggestion. :banghead: