I hope you mean that you want to remove the cooler on the north bridge so that you can replace it. Removing the actual north bridge chip will destroy the motherboard. That heatsink is larger than the heatsink you see on many other motherboards, so I would expect it to be doing a better-than-usual job of cooling the chip. I suppose you could lift the heatsink and apply fresh thermal compound in the hope that the existing compound is not working well enough.
As Pyree asked: what is the reported temperature? Ideally, you want it under 40 degrees Celsius (or lower), but I have seen systems operating happily with reported motherboard temperatures of 50 degrees (I suspect the sensor was faulty).
BTW: I hope you mean "guys" and not "gays". Our sexual orientation is none of your business!