Radiator is Hot HELP!

[Wenlu]

I have Thermaltake Water 3.0 Performer C, my CPU idle temp is suppose to be at 34-36c
but after a few months I just notice that my cpu temps is getting higher at 40c-50c idle temp
I always clean my pc every month, removing dusk in radiator and already change the thermal paste (small amount) and etc.
I just notice the tube and radiator is hot, so I don't know who's the culprit behind this. HELP!

 

[HEXiT]

mate your being to fastidious with the cleaning. unless your case is running without filters you should only need to clean it 1s every 6 months.
or every 3 months if its in a bedroom. clean it to often and you run the risk of inadvertently damaging something.

as for the cooler it doesn't sound good.
try tipping the case slightly while the system is on. tip it slightly forward backward left and right a few times. this will help the pump move any air bubbles that may be present and causing the thermal issue.

if theres air in the pump/block it will likely sound a bit noisy so have a listen to it. if you can hear a louder than normal pump noise tip the case as i said earlier and see if the noise goes away or changes pitch.