Open the hood on the Dodge and take a look. If you see one belt driving all the accessories then it has a serpantine belt. If you see multible belts driving the accessories, then is has standard drive belts. They may be V belts or U belts. You will have to look at each belt to see.
what is the engine size?
Timing belt.Timing belt.
Pull on the belt and you can see how the tensioner moves. Put a wrench on the bolt.
Change the belt
Normally this is the drive belt. Inspect the drive belt, and replace if worn. A loose belt may also cause this noise.
If it is a serpentine belt the idler pulley more than likely needs replacing. If it is a drive belt you are adjusting it too tightly.
The 1990 dodge caravan has a transverse mounted engine therefore it doesn't have a fan belt!
A 2004 Dodge Grand Caravan has one belt.
It is fastened to the a/c pump on the lower left side. A drive belt is attached to it.
PUT A NEW BELT ON IT
timing belt
A Grand Caravan does not have a timing belt.