Can you take the tensioner pulley off without taking with it on a Dodge Grand Caravan 2000?

No, on a 2000 Dodge Grand Caravan, you generally cannot remove the tensioner pulley without also removing the tensioner assembly itself. The pulley is usually an integral part of the tensioner, and they're designed to be one unit. Trying to separate them will likely damage both components. You'll need to loosen the tensioner bolt (often requiring a special tool or a breaker bar) to relieve tension on the serpentine belt, then remove the entire tensioner assembly to access and replace the pulley.