VN1600B dumped coolant at stoplight
I bought my mean streak last fall, so this is my first summer with it, FYI. But I rode it a couple hundred miles today and everything was great then I go stuck in traffic when I got back into town. It's 90° and clear blue sunny skies, sitting at a stop light after sitting in slow moving traffic when I look down and see a giant puddle of liquid under my bike. No warning lights were on the dash at all. So I take the first opportunity to pull off the highway and park it in a lot but leave the engine running and got on the ground to see if I could spot anything. It sat there running for a few minutes with nothing but then the radiator fan kicked on and coolant started to drip out of the overflow tank vent tube.
I killed the engine and pulled the side cover off and there was only a tiny bit of coolant left in the overflow tank. So I rode home, turned it off, and immediately took the side cover off again. This time there was more coolant in the tank (just below the low line), but after a minute or two of cooling it was completely empty.
For reference, I had just replaced the coolant a month or so ago and in doing so I did run it until I got hot enough for the fan to kick on and no coolant boiled out of the system at that time. And I'm not sure if this is relevant or not, but this couple hundred miles trip took me up into the mountains and I live (and this happened) far closer to sea level.