Transmission Fluid leaks into coolant 11000 Miles on 2003 Chevrolet Venture

Chevy Venture 03 110,000 Miles
Fluid and engine oil are both super clean,
But the Transmission Fluid is leaking into coolant.
Do I need to replace anything besides the Radiator?

Asked by for the 2003 Chevrolet Venture
Replace rad. Then recheck trans. fluid as coolant can seep into fluid with engine off !!
I agree with wetry
1 more answer
sounds like the internal trans cooler in rad is leaking. repl radiator and flush cooling system and reck trans fluid