Hallo, have 2008 xtx, last year my water pump fall apart, took my xt to servis and they repaired it with some sort of repairing kit! Everything was all wright untill today!

Two day ago temperature lamp went on after ridin my bike for 1 km. I stopped on the gass station and chacked the liquid (it vas lukewarm) and it was full of water. I took my xt to mechanic to see what was happening...
He left xt running several times for 30 min, everithing was normal, fan turned on, normal temperature and the lamp didnt go on! The only thing he seid was that the oil was to rare and mybe te motor is owe rheating! Ok he replaced the oil tested it again and everithing was ok!

As my bike was in the garege we check evri single thing on bike!
20 000km!

All things we replace:

oil, filters, spark plug, oil in forks (from 10 to 15), rear sprocket, chain

and everithing was perfect, xt was runing smoodly!

As I was coming back home, temperature lamp went on again and radiator cap was driping coolant liquid! I stopped wait motor to cool down for 1 h, and went home (3 km) wery slowly!

Before I go to sevice on manday, I would like to know, what could be the problem!!

My gues:

1. Termostat?
2. Coolant temperature sensor?
3. May be there is air in the sistem? How to irradiate the cooling sistem?

Thanks!