Cardone 20-990 Remanufactured Domestic Power Steering Pump 100% computerized hydraulic testing is performed for proper flow, leakage and performance to ensure perfect fit and function All critical components (i.e. campacs, spool valves, etc.) are triple tested to ensure product reliability All units are built with 100% new seals and o-rings Units are supplied with 100% tested and calibrated pressure relief valves Shafts are 100% processed to ensure surface finish is within O.E. tolerances A whining pump is usually caused by air in the power steering system. Inspect the reservoir for proper fluid level. If fluid has foam or air bubbles present, air has entered the system or has not been properly bled (ensure all hoses/clamps are tight). Some systems require special vacuum bleeding procedures. The problem is most likely in the steering unitthe pump does not know left from right. Check for binding steering components and repair as necessary. Use the correct fluid type that meets O.E. specifications for your vehicle Flush system with fluid to remove debris and contamination Install a filter to eliminate potential restrictions from debris Check for collapsed hoses that could potentially cause a restriction Always replace sealing O-Rings Never use Teflon tape as an attempt to seal fittings Leaks Lack of power assist while turning the wheel Whining, groaning or squealing noises from the pump Power assist only with increase in engine rpm