I also agree that the pressure in the radiator is directly related to the temperature the coolant is at in the system. The increase has to do with the expansion of the coolant also if the coolant reaches its boiling point that is when the pressure rises quickly but then is held in check by the pressure increase in the system pressure keepingyyy the boiling in check. The suggestion that the pressure increases in the top radiator tank or hose as the engine speed is increased is not necessarily true. As many replies mentioned that they are referring to a properly operating system. A system that pressurizes the top of the radiator probably has some plugging in the radiator tubes. You also have to remember the cooling system is a closed loop system. What pumps out the top of the engine must be simultaneously drawn back into the bottom of the cooling system for the engine. So in the scenario where the pressure in the upper radiator tank is higher from more RPM that would only last momentarily because in that system the vacuum created by the pump would likely suck the lower radiator hose closed or the pump would be overcome by the vacuum or lack of flow.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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