Ford Truck Enthusiasts Forums - View Single Post - Radiator woes continue
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Old 04-08-2014, 05:08 PM
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Originally Posted by harleymsn View Post
But his problem has nothing to do with overheating.

Yeah, that's why you do it. The thermostat stays closed until engine temp is reached. That means no coolant runs from block to radiator. The hole allows the coolant to pass before the engine heats up and removes the pressure. Also helps when trying to get the air out of the system.
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