Your fan will automatically turn on and off as required to keep coolant temps at bay. I would monitor temps with an SG or equivalent. If you find the temps not dropping when the fan comes on and/or the fan staying on for large amounts of time, slightly opening the grill block will be necessary. Remember that your fan takes quite a bit of energy to run, so there has to be a balance between energy saved with the grill block and energy lost with a fan that runs more often.
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