i was driving my car yesterday and i noticed smoke or steam coming out of my hood. when i pulled over to check it was coming off my coolant reservoir cap. so i let the car cool down and screwed it on better. it was also boiling so i checked and i barley had any coolant at all. so i got some coolant and poured it in today morning. i went for a drive and when i got back i noticed my coolant was boiling again. is there any reason for this? (also worth a mention that on my way home i turned my car off to cool off because when i looked at my temp gauge, in the span of a couple of seconds it shot op out of nowhere. as if it hadn’t been working before. then my car didn’t turn on for about 40 minutes)