The HVAC unit is different from the 99 model. One quick way to know is with the recirculation button, the 99 stays in when on and pops out when off, even if theres no power. On 2000 and up HVAC controls the button pushes in but comes back out.
Sounds like the issue is the controller and its a good start, get the correct part, clear the clog in the drain, and try it again. There's a useful thread on club3g on how to do this it can be found on the knowledge base section under the thread about common issues with the 3G. Most of that applies to the 8G as well.
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