My wife says she saw some smoke from under the hood but determined it was the car's exhaust in front of her. Anyway.... I pop open the hood. I notice a little antifreeze under the expansion tank. Figure it may have been there from when I filled it not long ago. I run the car monitoring the water temperature. Car has no gauge so I use OBDLink on my phone. Temp goes up to 220. Thinking that's high I shut 'er down. T-stat is rated at 192F. Googling says 220 is normal. Well now it goes past 220 and I see water coming from the expansion tank seam. I hope that's all it it.