G,day mate.
Yeah, Thermostat is on driver's side of the engine block, sorta near the bottom. You'll have to remove the windscreen wiper bottle out so you can get to it, pain in the arse really, I ended up getting my mechanic to do it instead :P
The sensor that controls the rad fan is indeed hydraulic, the connector is actually on the power steering pump which I believe you can only access from under the car. There should be a white connector. If there's a problem where the fan doesn't go full blast, then it might be related to that relay or the wiring back to the ECU - not too sure.
I had the same problem as yourself, I only live in Caloundra on the Sunny Coast if you need any help. If not, head to
www.auscam.org too if you wanna talk to the Aussie Camry drivers, most of us are from S/E Qld too mate.