The switch that reads open is the first thing to change..
let's hope the waterpump is ok.
drain the coolant.
fill the radiator cap with new coolant until it reaches the neck..
rock the bike from side to side and watch for air bubbles, then refill..
leave the radiator cap off and run the engine..
rock the bike from side to side and watch for air bubbles, then refill.
put the radiator cap on and run the engine
leave the engine to cool and open the radiator cap top up again
Now you should have about 2 litres of coolant in the bike
look in the reserve tank and see the fluid level, you will need a flashlight for this..
the level should be up to the top mark.
look for leaks under the bike..
Beauty is only skin deep but ugly goes right to the bone.