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A manually adjusted grill block gives you the best of both worlds. The advantage of a complete grill block for faster warm up times and yet it allows you to open it up for increased cooling on hot summer days and for those slow speed hill climbs. It does needs to to be combined with some means of monitoring engine temps (Scanguage coolant temp, or radiator fan LED indicator) to let you get the best use from a manual grill block. The only thing better would be an automated griill block controller responding to coolant temps.
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