I remember testing leak testing mine in the case before powering up the PC part. It reached 30 something C in a 25C ambient room. That was with the pump running but nothing else. Mine is a Mag 3, Maze GPU4, RBX with stock nozzle, and camaro heatercore. Try putting a fan on the rad and see how much airflow it takes to keep it near ambient with the pump only. If you cant get it to nearly ambient temp with just the pump as a heat source, you may have a problem.
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