Final answer:
Both air in the power steering system and a stuck-open relief valve can cause a constant buzzing noise, so both Technician A and Technician B are correct.
Step-by-step explanation:
The main answer to the question regarding the constant buzzing noise from a power steering pump is C. Both Technician A and Technician B offer plausible causes for the noise. Technician A suggests that air in the system could be creating the sound, which is often the case when there is a whining or buzzing noise, because the air trapped in the system can affect the smooth flow of the hydraulic fluid. Technician B believes a stuck-open relief valve could also be the cause, which would prevent the system from reaching proper pressure and can also result in strange noises.Explanation in more than 100 words: The power steering system relies on hydraulic pressure to assist in turning the wheels. When air enters this closed system, it can cause cavitation and lead to noise as the pump tries to move a mixture of air and fluid. On the other hand, if the relief valve, which is designed to relieve excess pressure in the system, is stuck open, the hydraulic pressure won't build up properly, also leading to abnormal sounds. Troubleshooting would involve bleeding the system to remove air or inspecting the valve to ensure it is operating correctly.Conclusion: Considering both scenarios can lead to a buzzing noise, the correct response is C, both A and B are correct.