1989 Honda Civic incomplete symptoms

Hello! I'm actually not sure if my car is a 4 or 6 cylinder. But here's the problem.
about a week ago, I thought I smelled burning anti-freeze -- it smelled like dry-ice, and the friend I was driving with said it was probably anti-freeze. There was white smoke coming off the engine when we stopped driving, and the engine was very hot, and still warm 2 hours later when I had to drive home.

I checked my coolant level and saw that it was low, so I put more in.

About 4 days later, I noticed the smell again, but this time there wasn't any smoke on the engine, and it wasn't as hot as it had been, though I'd driven for longer.