Sounds like Transmission Fluid is getting in to your antifreze.
Some types of antifreeze are normally red in color.
Red.
Red,
Red
Red
Red
Looks like a pinkish red to me.
Gm Dex Cool or equivalent. The red color antifreeze.
Usually it's red, yellow or light green.
red
'DEX COOL' it is red in color.
Check the color of the old antifreeze. It is probably red. This would be Hybrid Organic Acid Technology and should not be mixed with other types. 2000- 2001 is around the time that Plymouth changed to this type of coolant so its important to check for the red color.
Antifreeze is typically green, but the newer stuff is "gold". If you're getting red liquid leaking from the radiator it's probably the transmission coolant line.