CountMike is right. The type of fan - high pressure or high air flow - does NOT have ANY impact on where they should plug in on a mobo. I fully expect the fans supplied with this system are high-pressure fans since they are blowing though a radiator.
The central point, though is CONTROL. OP has not made the exact model clear, but since there is no mention of RGB lights and the "3.0" thing is in the name, I will assume it is the ThermalTake Water 3.0 Extreme S system we're talking about. I could not find a manual for that. However, it is clear from other ThermalTake products the intent is this. The PUMP unit should be connected to a CPU_OPT header (or a SYS_FAN header if necessary) and that header should be configured for PWM Mode and constant full speed operation. Then the two FANS on the radiator should be connected to the CPU_FAN header using a Splitter, and that header should be configured to use PWM Mode also (they are PWM fans) and normal automatic control. Thus all control of the CPU internal temperature is done by having the CPU_FAN header change the speed of the two rad fans while the pump always runs full speed.
OP, is that what you have done? A small additional point. On SOME of the ThermalTake systems (but not the Water 3.0 Extreme, I think) they include a small manual box to be used in the cables to the rad fans that allow you to change their speeds. IF you have anything like this, either do not use it (use a simple Splitter instead) or at least ensure it it set always to fast speed. That lets the mobo header do control properly.