2007 Saturn Ion ects

Hi just need to know were the engine coolant temperature sensor is. I have looked around and I Have found for other years that it was at the rear of the engine. As in between engine and firewall. Removed my engine cover to get a better look nada perhaps its behind something I cant see around... also is there away to avoid draining the coolant out. Yes I would still of course have it cooled down first. Anyways the main question is were exactly is it. Thanks for your help.