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I only have the lower grill blocked on the Prius, and on typical drives the coolant temperature stays at the normal temperature of around 195 F. On some long and steep hill climbs I've seen the temperature rise to just above 200 F, which is still within the normal operating range. Above 210 F I would remove some grill blocking, but so far this hasn't happened. Most of the grill is blocked on the TSX and that temperature stays around 188 F.
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