Quote:
Originally Posted by pop & blow
no harm to water pump at all but coolant cools the system better then water and keeps block from freezing minus 32 degrees coolant does have some lubicant ability to the pump itself.
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Hope you won't mind me disagreeing. He flushed the system with water, then ran the car without any corrosion protection for a week. When water, metals, heat, and air (there are little bubbles of air in the system) are combined, you get rapid corrosion. Flash rust can begin in a fraction of a second given the right condition. Try running an old brake disc under hot water.
Also, coolant is not a good conductor of heat. The function of antifreeze is to prevent the water from freezing, and to provide anti-corrosion properties. Only by mixing antifreeze with water, does this coolant solution become usable in our cars.
Water alone is the best heat conductor, and it has a high heat capacity. But, it provides no anti-corrosion. By mixing it with the minimum amount of anti-freeze for the lowest expected temperature, you get the necessary protection against freezing, plus some anti-corrosion. To provide the remaining anti-corrosion, you have to add something like water wetter or royal purple.
Corroded metals in the system will not only inhibit heat transfer, but it may damage the pump and seals. To make matters worse, it may further corrode. A chemical flush should be done to de-scale. It should be fully drained when the car is cold, rinsed with water with the thermostat removed, and filled up with proper solution before running the engine.