Re: How to know if water pump impeller is working?
As blackz3 says, high temperature reading would mean that impeller replacement may be needed.<br />If it is older then 2 years old, replace it. If you do not know how old it is, replace it. <br />It is a pretty simple thing to do it yourself. I change mine every year during the winter. This way I know for sure I will not have to worry about it when the season starts. <br />Good luck!