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I'm pretty much always running the heater in the Prius in the winter to keep the windows defogged. This runs 1 of the 2 cooling fans, which is usually sufficient to keep engine temperatures in the normal range even with a full grill block.
If I'm climbing a steep grade for many miles, the engine cooling fan might kick in with a full block. I'll open a strip up in the grill if I know I'll be operating at high load for an extended period of time.
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