Well, part of this is easy. To find the furnace you simply look on the outside of the RV for the exhaust port or ports. There should be one or two ~2" round exhaust ports. The furnace is immediately behind the panel with the ports.
Do you have an Operator's Manual? That should tell you what brand of heater you have. The typical WBGO RV has a Suburban brand heater - but yours is 21-years old so it's not something I have any knowledge of.
I found a photo of a 99 Adventurer. The heater is on the passenger side, mid-coach, just below the RV fridge vent. It's on a removable panel so you likely remove that panel to get to it. OR it's in a removable wooden panel inside the coach under the refrigerator (or both).
Here's a photo. I circled the heater exhaust outlet.
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2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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