FYI: Siennabraun is one of the 'unloved' colors used on squaretail '02's. You could get a premium for Inka, Colorado, or Taiga perhaps.
Any shock tower rust is a huge negative. ($$ repairs)
Burning through coolant -- this sounds very bad to me. ($$$) You must disclose this defect.
The e-brake needs to be fixed, in fact, the brakes, shocks, bushings, tie rod ends, etc. all need to be in very good condition to keep this from being a death-ride.
Trashed out seats are a major turn-off. Buy some decent used ones, install them and improve your odds of selling this '02. Better yet, fix the coolant problem NOW.
Cheap '02's are cheap for a reason: they need loads of $ put into them. Mine was semi-cheap back in 2003, but I have spent a lot since that time to get it nearly the way that I want it. I wouldn't profit any by selling it now, but it is a much better car than it was back then, that's for certain.