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Get under the car and look for small leaks that never drip on the floor. Many 2010 cars had a faulty thread on the coolant line from the block to the oil cooler. It's on the driver's side of the block and getting under the car is the only way to see it. There was a TBS on this.
If there's any sign of moisture there, you need to get the threads in the block repaired and sealed.
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