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Unless the s70 is very different from the 850 you don't have to take out the evaporator and the core is relatively easy. I have seen procedures posted on the web. Here is one description - there may be others that are better or have photos.
http://answers.yahoo.com/question/index?qid=20070320152232AAaJAEs
I did my evap and did not choose to replace the heater core at that time because it appeared that it would be easy to do if it ever came up later.
The heater/evap boxes get plenty of condensate in them. Mine smells from time to time but it seems to be mildew or some other growth, not coolant. I was planning to wait on the heater core until it had a leak I could see unmistakeably. If you go in for the core you can reach some of the inside to spray it out or clean it with lysol, dilute bleach, etc.
Good luck.
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