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If you have access to a durametric cable, run any codes you can off of it. 986 boxsters usually route the DME communication through the immobilizer. If the immobilizer is shot, the DME won't be able to be connected to. Another way you can check is to check around the immobilizer (underneath driver's side seat) and look for evidence of water. If you're still not convinced, disconnect it, and take the plastic housing apart and examine the circuits, if they look good, it's not the immobilizer at fault.
Thermostat and coolant replacement can be found at Pelican Parts in a coolant flush article. It's not the thermostat itself, but it'll show you the locations of most of the hoses and the routing.
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