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One of my 650s has a similar problem. When the heater is turned on (anything over 60 degrees on the temperature dial), it sounds like something is bubbling or an amplified water droplet sound. There is a rhythmic clunking as well that can even be felt in the steering wheel. I have cleared the cooling fluid lines and air bubbles. Although, someone suggested that there may still be a bubble stuck in one of the heating core valves. Others have suggested that a bearing in the heating core is bad. Not sure which one. Not worth the 10+ hours getting to the heating core to find out. I just turn on the heat to full, heat up the cabin, then turn it off.
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