There's normally a transmission cooler in one of the radiator tanks. Sounds like it has corroded through. Have the cooling system and transmission flushed after replacing the radiator. Petroleum products in the coolant will rot the rubber hoses from the inside, but more importantly, antifreeze doesn't offer the right friction characteristics and seal conditioners needed in the transmission.
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Wednesday, October 10th, 2012 AT 3:38 AM