* Engine Block Sides: Most will be on the sides of the engine block, often near the bottom.
* Rear of the Engine Block: There might be one or more towards the rear, sometimes harder to access.
Precise location without visual inspection is impossible. A repair manual specific to the 1997 Dodge Grand Caravan with the engine size you have will show their exact locations with diagrams and illustrations. Trying to locate them without the proper diagrams increases the risk of damaging nearby components.
If you suspect a freeze plug has failed (leaking coolant), consult a repair manual or a qualified mechanic. Blindly searching for them can lead to more serious problems.