Is there a repair for a cracked radiator on a 1991 Dodge Dakota 4x4 3.9L V6 air conditioned pickup?

Yes

AnswerGO TO CARQUEST & PICKUP A BOTTLE OF CERAMIC METALLIC SEAL & FOLLW DIRECTIONS CLOSELY...IT WORKS VERY WELL

Addendum

Stop leak works great, but be careful - it bonded to the head gaskets in my '94 Dodge Intrepid (3.3L V6) and clogged the coolant channels.