Water cooling plumbing problem

yesterday I noticed that about every other restart my CPU idle temp would shoot up about 25c. After checking for trapped air and such, I turned to the radiators. I broke out the BK 5500 and had a look



so far so good


This one is actually taken from inside the rad looking out ( that's a light fixture on the ceiling.



guess what the blue thing is? that is a protect plug for the inlet/outlets. I went back and looked in the radiator box and had the correct amount, so it apparently got pushed in at the factory. it does a great job of restricting flow though


While I had it apart i installed a second pump.

Before the plug broke loose and started messing with things i installed some sensors and was running :

Delta temp: idle/load 18c
Rad out/CPU block out 3c