Engine overheats. Customer already had replaced the cooling system thermostat and radiator.
Verified the customer complaint and that the electric cooling fan was operating properly. Found external system leaks (pressure test) and a block test was negative (no combustion gasses in cooling system – head gasket intact). Removed cooling system thermostat and re-installed thermostat housing. Removed upper radiator hose and provided alternate water supply to radiator. Started engine and checked water flow. Almost no flow was present. With customer authorization the water pump was removed and checked. As you can see the impeller was found to be almost completely rusted away. After talking with the customer, it became apparent that even though a timing belt service had been performed before the water pump was never replaced with the service. The severe deterioration of the water pump metal impeller also shows that proper cooling system maintenance was also never performed.