Coolant overflow

Gidday fellow banditos,
I'm having a problem with my 2012 1250 bandit. I keep getting  a release of coolant from the overflow pipe. I have recently replaced the radiator cap and thermostat. I ran the bike for about 15 minutes and noted that pipes going into and out of the radiator were warm to hot however the fan did not kick in and when I turned the bike off, about 50 mls of coolant flowed from the overflow pipe. I had a mate check the fan by shorting it, and it worked...so not a fan issue.
My next port of call is the temperature sensor. Are there 2 of them and has anyone used an aftermarket sensor that works well?
Any assistance would be appreciated help

@madmax had a similar issue on his gsx1250. I think he just had an airlock from memory

Hey Reddog,
thanks for the reply. I tried running the bike with the radiator cap off to get rid of any airlocks but all that happened was coollant ran out of the radiator as it didn't appear that the thermostat hadn't opened at that time.
Cheers

If you type coolant into the top search box by the home page header , you will find Madmax's post on the subject and also a few others on the subject .

Thanks Chook, I will give it a go and let you know how I went.
cheers

When I changed coolant I rocked the bike from side to side, let it cool down and repeated the exercise. I've had no problems

Twatty wrote:Hey Reddog,
thanks for the reply. I tried running the bike with the radiator cap off to get rid of any airlocks but all that happened was coollant ran out of the radiator as it didn't appear that the thermostat hadn't opened at that time.
Cheers

Did you replace the thermostat because of the coolant loss or are you having coolant loss since the thermostat replacement.

Hi Truck,
i put in a new thermostat because it was overflowing. I have previously followed others directions to rock the bike back and forth but I have yet to bleed the water pump. I will have a crack at that tomorrow.
Cheers fellas

I believe it is the top bolt on the water pump, it is different to the other two. You don't need to remove it completely, just enough for coolant to leak out the retighten.
Running with the cap off won't fix it. I tried that several times  including rocking the bike and squeezing the bottom hose. 
The air won't come out of the pump except out through the bleeder

Thanks madmax,
The thing that annoys me most is that I haven't had the coolant emptied and I can't get to it at the moment coz of the bad weather. I'm definitely giving everything a go before I invest in a temperature sensor and relay, only to replace them and find I still have the same problem. I identified the bleeder bolt on the water pump, through the internet, now its just a matter of getting it done
Cheers

Mine will spit some out if the level in the overflow bottle is a bit high until it finds its right level .

Hi Guys, 
today I bled the water pump, revved it and noticed a few are bubbles come out through the radiator neck, shook it for good luck and topped the fluids up slowly. I went for a ride albeit a short ride and to my delight, no fluid loss.
The real test will be on a hard or hot ride but for now it seems all the remedies have culminated in a success.
Cheers to all the chaps who have provided assistance.
Twatty

Happy riding .

Twatty wrote:Hi Guys, 
today I bled the water pump, revved it and noticed a few are bubbles come out through the radiator neck, shook it for good luck and topped the fluids up slowly. I went for a ride albeit a short ride and to my delight, no fluid loss.
The real test will be on a hard or hot ride but for now it seems all the remedies have culminated in a success.
Cheers to all the chaps who have provided assistance.
Twatty