[SpudRider]

Originally Posted by NoVa Rider

I also noticed my coolant bottle was low a week or so ago, and filled it to the "top" mark, and it also seems to be gradually dropping. Like Spud I am beginning to wonder where the coolant is going. I don't accept the "evaporation" theory, since none of my other bikes (or cars) with non-pressurized expansion bottles loose coolant at anything like this rate...

I suspect you have a small air bubble in the left radiator. Keep filling the coolant overflow bottle. The air void will disappear, and the coolant level in the radiator should stabilize. After that point the coolant level in the overflow bottle should begin to drop at a much slower rate.

Please remember, I have now recorded about 8,250 miles on the odometer of my RX3. Therefore, I had ridden enough miles to fill the coolant in the left radiator. The coolant level in my radiators has now stabilized at full. Nevertheless, the coolant level in the overflow bottle continues to fall, but at a much reduced rate.