When I bleed my cooling system, I would first remove the lower bleed screw at the lower right near the water pump. Fill the radiator watch for the coolant to flow out the lower screw hole, then reinstall screw. Remove the screw at the thermostat, top up the coolant and start the engine run the engine watching for the coolant flow when the bubbles are gone or reduced reinstall the screw torque the bolts to 7ftlbs top up the coolant replace the cap and top up the overflow bottle. When cold check the radiator level and look at the overflow level. I always did mine with the front of the rhino elevated thinking that it helped. 50/50 coolant is best, any stronger is a waste.