never trust anything new
check the water temp in the top of the rad with a good kitchen thermometer first, or with a laser thermometer - next check that the thermostat is really working, dunk it in a pan of water on the stove .... then report the distance your fan is from the rad and whether the fan is fairly centered on the rad top to bottom, higher temps at lower speeds makes it sound like the pump is positioned wrong for your truck or you need a shroud
Bill
