> I don't believe the fan belt has to be any tighter than required to
prevent
> slipping.

Actually, if it's too tight it can cause the water pump and alternator
bearings to wear prematurly.

> Also, maybe that stop leak coolant additive really does lubricate the
water
> pump?

All modern coolants contain stuff to lubricate the water pump... no need to
add anything for that...

Bill