Quote:
Originally Posted by 996AE
You have an open 2 inch water pump hose on bottom of engine and air going in top of coolant reservoir. Putting in air with little resistance due to open end of 2 inch hose cant cause much back pressure.
Seems pretty straight forward with very little risk if any.
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Not quite. While the system may be partly emptied when the air is applied, there are still sections that are relatively full, and you get water hammer, not unlike what you get from a faucet you turn on after opening a household water line, and that is just one of the "very little risks".