This problem has been popping up on a very regular basis on the Boxster and 996 engines. So much, that I think I am going to start recommending waterpump replacement at about the 80k mile or 10 year mark as that is about when they seem to be failing. Failure can be leakage from the bearing weep hole, and if that is let go for more than a few days, the bearing and impeller are going to explode. Not a pretty sight.
We had done a full service on this boxster a few months ago. When the belt was replaced, the pump still felt good and tight (check it any time your belt is off). Well obviously she finally let go and threw the 5k mile belt off and destroyed that. Doh!
Here you can see the belt hanging down and the coolant leak.
Waterpump is located on the bottom corner of the engine.
The pulley was hanging off the pump, so I suspected the interal impeller had exploded….I was right. The waterpump impellers are made of plastic, and so it stands to reason that over time the plastic will become brittle due to the heat, and eventually come apart.
Since I had pieces of impeller laying in the cooling system, I pulled the thermostat housing to clear it of any debris and also flush the system of debris
I found a few bearing pieces here in the valley and was able to clear it all out. Then I pulled the hose to the thermostat and flushed the forward lines.
Tomorrow night I will get the new pump installed and back on the road!