What happens if you put transmission fluid in radiator?
What happens if you put transmission fluid in radiator? Transmission fluid will attack the rubber hoses and seals, making them expand, soften, and fail. A quart added to the system will wreak havoc in a hurry, and be very difficult to flush out. If you put it in the coolant reservoir; DON'T START THE ENGINE, remove the tank, and clean it thoroughly. Why do I have trans fluid in my radiator? Trans fluid in the coolant could be a sign of a crack inside the radiator allowing one to leak into the other. Have your engine coolant flushed and replaced,...