Do you have a clean coolant system??? do you run it with just water in the coolant system??? is the belt on the pump too tight??? this is what you have to look for...
I have never used any cleaner in my system and the system was flushed a while back so I have fresh antifreeze in my system. 50/50 mix. The belt is easy enough to take off by just pressing on the pulley with your hand so it can't be to tight, if anything it's on the loose side by the way the tensioner was designed.
DaveNC
