it cools down when moving! just gets really hot when sat still!

im useing a spal fan on the front of my (rather deep) radteck intercooler...i called radteck yesterday and they reckon its my rad thats playing up (addmitidly its old) but its just there aint no room to move the fan between rad and cooler not without removing the front of the bumper and that aint an option!

hence why i was looking into pc fans! i seen some cars with them there was a fiesta xr2 tubo in performance ford with them on.