Transmission fluid in radiator

The transmission fluid cooling lines (which enter the radiator on the driver's side of the radiator/high and low) probably has a hole in it somewhere inside the radiator.

Anymore, the 'fix', would be replacing the radiator.

I think this would be your radiator. See link below:

https://shop.advanceautoparts.com/p/carquest-radiator-431406/19920070-P?searchTerm=radiators#

Depending on your location and available parts stores.

This or the same sort of method at another parts store may save you a chunk of change. See how I do well in this link. Keep in mind, promos do change over time and you might have to do a little homework!

https://www.2carpros.com/questions/2001-dodge-neon-milage-just-want-put-fliuds-their-locations

Let us know how it goes.

The Medic