My car wasn't overheating while driving. But last night while sitting idling in a drive thru forever, I started hearing a odd noise from the front, and my passenger noticed "smoke" coming from under the hood. I shut the engine off and popped the hood. The water in my radiator reserve tank was BOILING and had popped the cap partway off. Fortunately I had a full bottle of new coolant in the trunk. (bought it planning to drain/flush/refill when I get a night off). That cooled it down well enough for then. After the car cooled down 4 hours in the work parking lot, I removed the radiator cap, and the radiator is still full. I also checked the engine oil level, it's fine. But on my way home I noticed it's getting hot fast while sitting idling, i.e. at red lights, but stays cool ok while driving. I'm used to cars with belt driven fans, not electrical like in this. I noticed that the fans are NOT running when the car is idling in park. Is that normal, or is that my problem? (I figure it is, but want second opinion) Unfortunately my nursing work schedule is hectic with the virus still going strong here, and I can't get enough time off to do more than a "quick fix" for now until my Monday 5/18 one night off. Any help?