1. Air in the System: If there is air trapped in the power steering system, it can cause a whining noise. This can happen if the system was not properly bled after the pump was replaced. To fix this, you can try bleeding the system by following the instructions in your car's owner's manual.
2. Defective Replacement Pump: In some cases, the replacement power steering pump itself may be defective and causing the whining noise. If this is the case, you may need to have the pump replaced again under warranty.
3. Other System Issues: The whining noise could also be caused by other problems in the power steering system, such as a faulty belt, hose, or bearing. If the noise persists after bleeding the system and replacing the pump, you should have the system inspected by a qualified mechanic to diagnose and repair the problem.
