Two Technicians Are Discussing a Vehicle with an Overheating Problem

Multiple Choice

Two technicians are discussing a vehicle with an overheating problem. There are no leaks, internal or external. The belts are in good condition, and the radiator has been removed and flow tested. Everything appears to be in good condition. A new thermostat was installed, but it did not cure the problem. What is most likely the problem?

A) The impeller could be slipping on the water pump shaft.
B) The impeller blades could be corroded.
C) The impeller could be slipping on the water pump shaft or the impeller blades could be corroded.
D) None of the answers is correct.