2007 Acura mdx running hot among other things

197k . It’s never done this . I noticed the ac was starting to blow kinda warm and I noticed it was running extremely hot and as I started to pull over it started smoking. I let it sit and cranked it again and it started shaking violently . It’s also leaking clear fluid . No check engine . Any idea ? I’m afraid it’s the head gasket by the symptoms . Toning belt was supposedly changed right before I bought it at 191k. Oil was changed 3500 miles ago.