Belt tensioner my belt slipped off?

I have the 3.3L in a Dynasty and two Caravans. In the Dynasty, the nut can be reached from on top if you lay right in front of the antenna. I don't think there's enough room to do that on the minivans.

To release tension, use a long 15mm wrench on the bolt head in the middle of the pulley. If you're lucky and if you have just the right wench, it can be hooked on the metal bracket that holds the AC pipes to the right strut tower. Otherwise, you need two hands. One to pull on the wrench to pivot the tensioner pulley arm; the other to slide the belt off one of the pulleys.

As I recall, you have to go from underneath on the minivans and reach up to the plate the pulley is bolted to. You may need two different 15mm wrenches. One will get the nut loose, but you may not be able to turn it enough to get another bite on it with the same wrench. Use the other wrench to turn it a little more, then alternate back and forth a few times until you can turn the nut with your fingers.

When you install the new tensioner, observe there's a tab on its backing plate that has to seat in a small hole.

When you install the belt, the last pulley to slide it onto should be one without ribs. The idler pulley is a good one. The power steering pump pulley is good too, but you have to be working from the bottom as that's where that pulley is.

If your videos don't match up, be aware there was also a 3.0L V-6 engine. I have two of those too. They are totally different in design and a little harder to do this job on.