I followed everyones advice and removed the LU today and took the water pump off. They impeller was intact but I could see that some of it had melted to the housing wall. Does this indicate a bad impeller? If so could that be the reason my engine is overheating? I also noticed that it had only melted to one side of the housing. How fast does the impeller spin? I think that this could be the reason why my tell tale only squirts water in spurts rather than one solid stream. My drive shaft is also missing the o-ring that goes on the top. It would be OK to put it on when I put the LU back on right? Thanks for the help.