The 'mickey mouse' belt tensioner is one of the causes of overheating, which I believe leads to water pump and engine failure. It often sticks in one position rather than adjusting properly. I luckily caught this ehen changing to Dexcool antifreeze. I now check this every 10k or so. I also use Tufoil in the engine (check their web site) - the engine does run cooler. When the antifreeze was changed, the engine temp went to the end of the 'normal' range, but did not overheat! It reduces friction (and heat) to the extent my heater 'doesn't' work in my Aerostar incold weather without partially blocking the rad.
