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Automatic Transmission Fluid is often circulated through a small section of a car's radiator to keep it cool. Getting coolant mixed with your ATF would mean there is a problem with your radiator. Remove the radiator from the car and get it into a radiator shop for repair. Don't drive the car because you'll risk permanently damaging your transmission. A radiator repair should be fairly inexpensive, even if you have to have parts de-soldered from the core and replaced. Even a new replacement radiator is relatively inexpensive if you R&R it yourself. Have fun.

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Q: What would cause automatic transmission fluid to leak into cooling system?
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