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Message: <blockquote data-quote="AshleyQuick" data-source="post: 373502" data-attributes="member: 39034">A few days ago, this 2003 LeSabre threw off the serpentine belt because the water pump/pulley was rattling and spinning unevenly. Fortunately, this happened a block away from an Advance Auto so we were able to get it to their parking lot.I bought a new water pump and installed it without properly draining the coolant. They weren't open at the time so It basically just drained out onto their lot as I was removing the old pump (mistake).I was able to scrape off the old gasket with a metal wire brush so that I had a clean surface and installed the new pump, reinstalled the pulley and the belt and then filled with nearly a gallon total of new coolant and distilled water. I had no idea how much was in the system AND I filled in the overflow tank (assuming this was another mistake?).So I then started with the overflow tank cap open and let it run for a few minutes with the heat on. The pump/pulley was now spinning properly but after several minutes, coolant was seeping out from the pump. I tightened everything down with the new gasket so what could possibly cause this new leaking? I just turned off the vehicle and came home to post this before further proceeding.</blockquote>