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Partly block the radiator in winter
In Winter, partially blocking the radiator by putting a piece of aluminum foil near the middle has been helpful to me. A use a rectangle that covers about a quarter of the front of the radiator.
Pure speculation as to why this has worked for me:
It lets the engine warm up a little more quickly
It causes the radiator thermostat to open more, reducing the resistance that the engine's water pump must work against.
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