You should be able to pick up a Haynes aftermarket repair manual in most auto parts stores.... probably around $20. The one that I have covers 97-02, and does give basic instructions for heater core replacement.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.