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Message: <blockquote data-quote="duff daddy" data-source="post: 928746" data-attributes="member: 10730"><p>Remember in a cooling system there are a few things. you have 2 different types of "heat extraction". 1 being heat from the engine to the coolant and the esecond from the coolant to the radiator. Also you have 2 main parts of the second heat extraction. You have a heater core and also a radiator. If coolant flow is slowed through either of the passages then you can have excessive heat build up causing the coolant in the block become too hot and thust causing a car to over heat no matter how low the t-stat or the water pump works. Check coolant flow rates and see how that is.</p></blockquote><p></p>