I recently purchased a 2007 STS-V and lately the "Engine Hot - Turn AC Off" warning has been coming on. I looked it up in the manual and it says it's caused by the coolant fluids getting too hot, however it is winter time and it will come on like once a week and stay on for a day or so and not necessarily when I've been driving it a long time. Also, when it is on my temperature gauge does not work. Anyone had this issue or know what the solution would be? Thanks for any help you can give me.