Automatic transmission fluid turns into a pink milky consistency, like a strawberry milk shake when it mixes with coolant in the radiator well. The transmission’s cooler is located in the coolest radiator well, after the coolant has flowed through the cooling fins. When a leak forms in this cooler, the two liquids mix resulting in pink transmission fluid. The engine's coolant will also contain transmission fluid. It can be seen swirling around in the radiator neck. A flush will be required to remove these contaminated fluids.