Oil in coolant but no coolant in oil

'IF' automatic transmission (?) .. It is indeed possibly transmission fluid you're seeing in the coolant .. Both the engine oil and automatic transmission fluid pressures are greater than the coolant system pressures .. While vehicle is being operated .. When parked - then residual coolant system pressure is greater .. It may take awhile for coolant to show up in the engine OR the 'automatic' transmission .. As stated - to prevent the potential for very costly engine//transmission damage .. Highly recommend visiting local auto repair facility for hands-on inspection and testing.

Hello, Check your transmission fluid for coolant. If the radiator is leaking internally, those will combine. Either way, this vehicle needs to be diagnosed before driving to prevent catastrophic damage.