byron -
with most water pumps, the issue is the bearing. with the plastic pumps, there is the ADDED concern that the impeller can shear off at the hub, leaving it just uselessly sitting there. if you are missing vanes, IMO that occured as a result of foreign object damage.
as for cleaning the cooling system? there are the radiators, the heater core, the overflow tank, and all of the connective tubes. i believe the boxster's heater core ALWAYS has coolant circulating & that heat is actuated with air flaps rather than water flaps. this means your heater core could be mucked up, too......
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Originally Posted by Byron in Atlanta
So Jake....Have you guys ever seen a water pump that just started shedding vanes from the impeller? If the impeller was completely gone, I would be more inclined to agree with the diagnosis that the water pump impeller broke apart. Normally when we are talking about water pump failure, we are talking about bearing failure. The bearing in this water pump is perfect. The fact that just the vanes are chewed off is what led me to conclude that the engine bits from the exploding case destroyed the vanes, and not vice versa. Truth is, there is no way to be sure what really happened. It's all water under the car now!!! 
My two concerns now are how to adequately evacuate the cooling system of debris and will it be best to go with a OEM water pump vs. after market? |