bfam

Just trying to get some help with whats going on with my Tahoe. Been a great car for a long time, kept good maintenance on it. Recently, the interior lights will flicker on and off, not the exterior lights, just interior. I can smell gas from time to time. Not too strong but strong enough to notice.
Just within the last day, it made a screeching noise and started smoking, and the temperature gauge quickly rose. I checked the coolant, it was low so i put some in it, it seemed to help but the temperature gauge still goes up quickly. Not sure what is all going wrong but if anyone has any ideas it would greatly appreciated!

tech2

white smoke out the tailpipe?