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Probably another engine.
Since you don't know why it got hot in the first place, it would be impossible to know what is damaged now.
The knock is probably from lack of lubrication because of the contaminated oil. And that would mean all of the bearings are worn. And a leaking head gasket or cracked head could allow coolant into the oil.
If it has more than 90,000 miles on the engine its probably not worth rebuilding if it needs all of the bearings replaced plus the cause of the leaking oil/coolant repaired.
Sorry!,..More than likely the front seal of the transmission has actually cut a groove into the torque convertor neck.I have seen these hundreds of times, when the van is hot the seal wont hold the fluid pressure behind it and trans fluid will leak past...also the lines/hoses are on the side of this transmission..the vent is located on top of this trans near the main connector,.not in the front(Ax4n).,, seriously go to an accredited trans shop only for this repairATRA......again sorry for the bad new..Bob Stinson
First of all ensure that your car is leaking coolant fluid, and what is dripping is not just water condensation from the air conditioner. If you have a coolant liquid leak, it can be from one of the ducts leading to radiator , from water pump or radiator itself. Check liquid levels, and if you have a leak have the car inspected by a qualified mechanic. A broken water pump, for example, can cause your motor to blow in few miles.