I have a GRS intercooler, single 10" Kenlowe fan and newish standard rad,running 19psi. When driving it is at the very bottom of Norm and then when i pull up in traffic or lights it starts to rise a little but as soon as it does the fan kicks in and brings it straight back down to the bottom of norm.(and thats in the summer). Its great, since its all been fitted its never seen past half way!