It sounds like bubbles, but it's rapid....like when you boil water on the stove over really high heat. I've seen it before (before I replaced the water pump), and it was bubbling and rocking back and forth....kinda odd, lol.
As far as the "birdcage" light, (add engine coolant) it came on about a year ago, and I bought more coolant, but my mechanic said that it was full, and simply unplugged the sensor. He said that the sensors sometimes go out, and will tell you that you need to add stuff when you really don't.
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