hardline water-cooling flow problem

[De_UWlover]

hello, I hope someone can help me
this is my first water-cooling experience and it worked fine. 
after a while, the in and output of the graphics cards water block started dripping because the PETG Tubes shrink overtime because of high temps (pump not fast enuff)

I rebuild the loop (the same way as before) but I had flow issues.. first few seconds no problem and after a few seconds it´s like I slowly block off an exit... 
I filled the loop through the use of the pump and vented all the air.
like 5 times.. can anyone spot a flaw?  
Loop Goes: 
Pump out -> CPU in -> CPU out -> GPU in -> GPU out -> Rad in -> Rad out -> Pump in (see pic)
(parts used: 

Spoiler

alphacool nexxxos monsta 360mm radiator
Alphacoo Eisblock XPX CPU 
alphacool-eisblock-aurora-acryl-gpx-n-rtx-2080/2080ti-fe-2070-2080-super

Pump/Reservoir

 )

 

Thanks in advance

[Guest]

I can see the water line in the tube there.

 

What does the pump rpm reading look like? Does it fluctuate? Does it slow then stop? 

If it looks normal, maybe vent the loop until you're at max temp sustained, then cap it. 

 

[De_UWlover]

Thanks for the suggestion! 

 

right now there is air above the reservoir because is messed around with the loop before. 

Sadly the rpm display of the pump faces the rad itself so I cannot read it but from the noise ist sound pretty stable. 

 

I'll try to cap as you said! 

 

 

Edit: I refilled, heated, and capt it but no difference. I think the rad is the issue bc the hot water distributes not as it should and I don't know why... 
when is rebuild the loop (from the only CPU to CPU and GPU cooling) I rinsed the rad.. cloud I damage something?

[De_UWlover]

ist seems like only the top of the rad gets warm... and i have no flow whatsoever