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Pedro on Pedro's board has over 200,000 miles on his original pump and he believes that some of the early pump failures are due to people occasionally opening the coolant reservoir cap when the engine is still hot. It is, of course, supposed to be a sealed coolant system and he believes that bubbling when the cap is removed can lead to air locks (as well as reduced coolant due to vapour) that ultimately cause failure of the impeller. His rule is to never remove the cap; if coolant is down, there is already an issue.
Brad
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