Ah, I see you asked the previous question I answered as well.
Here's the deal. The CPU fan needs to be PWM controlled - of you plug multiple fans into it via a splitter or some other device, the BIOS can't read the speed and adjust it. No speed reading = fan error. Read the manual on how to install it. Usually the radiator fans are connected to chassis headers on the motherboard or to a fan controller that's part of the pump.