I'm just getting into working on my own cars, so pardon my ignorance, but is there a write up or a link to some pictures of how to check the actuators and how to get to them?

Also, even if it is Dexcool sludge (the previous owner did switch to green), my flushing did not remove the caked on stuff, just the loose stuff. Am I still looking at replacing the whole cooling system, or should I just keep an eye on it and let it go as long as it's working and not overheating?