Advice!!! 636 out of action

Hey guys
i rode my bike from beacon hill to chatsood(25 min ride) and was waiting for lights, when i noticed the temprature of my bike reach 115 then it started to flash... i immediately turned around and took it to a bike shop and asked for there advice as to why my bike would be overheating.
they said have you checked your coolants so i did and noticed my coolant reservoir was empty. so i got my tools out and pulled my bike apart to get the coolant and filled it up.
I thought to myself oh yep that was probably it so i continued my trip to blacktown going along the m2 i notice my temp continue to rise until it reached 119 then (HI) flashing, this was when i was going 100kms in sixth gear so no strain on the bike but was still overheating. I pulled over and noticed as soon as i stopeed the coolant fluid was spilling from my bike ( i think from the run off hosing) i let it sit for 20 mins thinking mayby it just needed to let the coolant go through the system. but no it continued to overheat. so i got a friend to pick my bike up and take it to team moto at blacktown. they are gonna look at it for me But what do you guys think it is?
the fan was working i checked that and it seemed like it was running fine except the temprature. When i first got off the bike and placed my hand on the reservoir it felt like the coolant was bubbling inside is that normal?
really wrecking my head any help is massively appreciated my bike is an 06 636 btw
i rode my bike from beacon hill to chatsood(25 min ride) and was waiting for lights, when i noticed the temprature of my bike reach 115 then it started to flash... i immediately turned around and took it to a bike shop and asked for there advice as to why my bike would be overheating.
they said have you checked your coolants so i did and noticed my coolant reservoir was empty. so i got my tools out and pulled my bike apart to get the coolant and filled it up.
I thought to myself oh yep that was probably it so i continued my trip to blacktown going along the m2 i notice my temp continue to rise until it reached 119 then (HI) flashing, this was when i was going 100kms in sixth gear so no strain on the bike but was still overheating. I pulled over and noticed as soon as i stopeed the coolant fluid was spilling from my bike ( i think from the run off hosing) i let it sit for 20 mins thinking mayby it just needed to let the coolant go through the system. but no it continued to overheat. so i got a friend to pick my bike up and take it to team moto at blacktown. they are gonna look at it for me But what do you guys think it is?
the fan was working i checked that and it seemed like it was running fine except the temprature. When i first got off the bike and placed my hand on the reservoir it felt like the coolant was bubbling inside is that normal?
really wrecking my head any help is massively appreciated my bike is an 06 636 btw