[Daffie]

I know this thread is from years ago but this same exact thing is happening to our 2003 chevy blazer. Started 7 days ago, the coolant was low and tempature got hot but not redline and the oil gauge and gas gauge were not working then we added coolant and they started working again but the oil gauge used to always stay between 20 and 40 closer to 40 while driving but now its different.
When we 1st start vehicle it stays close to 40 like before but after it warms up a few miles down the road theit stays close to 20 while driving but drops to barely above 0 or to 0 when stopped at a red light then goes back up to almost 20 while driving. Got oil change yesterday. No smoking, noises, ticking and its not running any different. Was this ever figured out?