i just went thru this check if there is junk in the top of the rad tubes lower the fluid level and see if you see rust flakes in the top of the tube. so i spent 900 on a griffin as the champion did not cool as much as i wanted. i installed a coolant filter and the stuff i cought with the filter well it saved the rad from pluging the tubs. my car runs 210 in stop and go traffic with the a/c on in Florida 100 temp day driving down the road 185 im so happy with the griffin rad i would buy it again.