i have a 04 RX8 that has been getting hot. about a month ago it got hot so I changed out the thermostat and it seemed like everything was ok, until yesterday when it got hot again. I took a look inside the overflow jug and no coolant. Question, is there a full line on the tank when you are putting coolant in there, and what else should I look at. Also i can hear the electric fans kicking on. need some help on this one

 

Diagnosing car engine overheating and antifreeze leaks - Troubleshooting car radiator coolant loss and high temperature leaks

 

what is this?

 

yesterday the car got hot again, it even turned off and wouldnt start until it was cooled off. now what