Let me help. It's not the IC pump, heat exchanger, intake, radiator, maybe the s/c pulley by chance? Like Mrphotoman recommended exchange it or sell it. With your stock one you had no problems. If the performance is the same with a crank pulley and a SC pulley then why isn't there SC overheating issues with the 178 crank pulley. Believe me I want to the SC pulley succeed, the stacked pulleys is a great option for future power. Maybe the pulley is too small and creates too much heat for the SC. More testing perhaps to make it just as reliable as the crank pulley. I hope you get it solved, because just like the MB guys went through the trial and errors of the crank pulley when it first came out, you will be one that helps solve this SC overheating issue from the SC pulley.