Hi Eric,
Thanks for your advice. I’d already seen your Youtube video and tried burping the system, although it was a little more difficult for me because I didn’t have the no-spill funnel that you used. Where did you get that by the way?
In your opinion, what could be causing the gurgling sound only when the heater knob is set to full HOT, but not when it is set to full COLD? And is it ever possible that the drop in coolant level happens only with the full HOT setting, but not the full COLD?