Why is there transmission oil in my radiator?

is my car finsished after this? what to do to fix it?Why is there transmission oil in my radiator?
The trans cooler is inside the radiator... The coolant and trans fluid is separated by thin plates that rot out and leak over time, which lets the trans fluid into your coolant section, and vise-versa. Most radiators act as an engine coolant cooler, and trans fluid cooler.





Replace the radiator... flush the system, you'll be fine.Why is there transmission oil in my radiator?
your radiator is shot .
because the bottom of the radiator is also a trans fluid cooler. hard lines at side or at bottom are these lines running to the tranny. the tranny runs cooler because the oil circulates. however they are two different radiators in one. and now yours is shot. usually they are more expensive to repair than replace, since the radiator has to be mostly dismantiled.
the trans cooler broke inside the radiator, you will have to get a new radiator and have the tranny flushed and your engine coolant flushed.
Go with Mr Deviances' answer; He is dead on
The cooler is leaking. Remove the transmission lines, thoroughly flush the system. Remove the radiator %26amp; purchase a new one. Do not waste your money getting the cooler repaired as the rest of the rad is probably on its way out.





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I do not know what make/year your car is, but alot of cars have transmission cooler lines that run into the radiator. Seems you have a leak in one of those.