So.. After a 3 hour ride yesterday I noticed my temp light came on. Then noticed my fan had stopped running. I spun the fan by hand then checked fuses. All good. I get home and start taking things apart to get to radiator. It’s empty. Just a lil tiny fluid in very bottom but reservoir is showing a little above full. Im sure there’s a sensor in the rad to kick the fan on but with no fluid it’s getting hot. Never noticed a leak or anything. Any ideas of where to start. Why would radiator b empty and reservoir b full?