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Message: <blockquote data-quote="toyman" data-source="post: 1066431" data-attributes="member: 10841">We are talking about a closed loop system. Running through a house doesn't meet the criteria. Balancing the hydronics in HVAC system is a different matter. The fact is an engine will generate a certain amount of heat at any given load. The function of the radiator is to dissipate that heat. If the radiator can transfer the heat out faster than the engine can create it, yes the t-stat will start to close to reduce the flow to maintain the desired engine operating temperature. You are making the assumption that the reduced flow is what is cooling the engine when in fact it is the reduced flow through the t-stat that is allowing the engine to move back up to it's design temperature. And I would not assume that someone smarter than us designed the system but rather someone whose area of engineering knowledge extends into an area where our knowledge is limited. So, I'll ask you, why is there a need for extra cooling capacity radiators and high flow water pumps if all you have to do is slow the water flow through the radiator for better cooling?</blockquote>