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I'm still not getting it .... if the coolant coming out of the radiator is so cold then the engine will cool off AND the tstat will shut off and then NO coolant goes to the radiator thereby warming up the engine again. Seems like a grill block wouldn't make a difference in this control system unless the problem is one of the engine getting up to temp and then the very cold coolant bringing it back under temp over and over again. That would make sense in that a grill block might stop that from happening.
Not questioning the aerodynamic benefits of the grill block just the statement of fact that a grill block helps keep the engine warmed up.
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