When I measure the temperature (infrared thermometer gun) across the face of the radiator it is warmer at the top than the bottom. The hottest spots are either upper corner. The temperature drops from the edges in towards the middle across the entire radiator.
Looking at the airflow (tuft of yarn), in front of the radiator the upper corners are dead spots. On the engine side, the air is moving out away from the fan at the upper corners.
This leads me to think that the radiator is okay and a lot less cooling is taking place where the fan isn't.
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