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Removal 1. Disconnect battery ground cable. 2. Disconnect power steering pressure (PSP) switch electrical connector. 3. Remove power steering pressure (PSP) switch from power steering pressure hose. 4. On 2.0L engine, remove one nut, two bolts and disconnect power steering pressure hose from power steering pump bracket and engine lifting bracket. 5. On 2.5L engine, remove one bolt and disconnect power steering pressure hose from front engine support insulator. 6. Remove power steering pump auxiliary reservoir as outlined. 7. Raise vehicle on hoist. Refer to Section 00-02. 8. Remove front sub-frame. Refer to Section 02-01. 9. Remove six bolts and steering gear cover plate from front sub-frame. 10. Disconnect power steering pressure hose and power steering return hose unions from steering gear. 11. Remove two bolts retaining power steering pressure and return hoses to front sub-frame and remove power steering pressure and return hoses. CAUTION: Whenever the power steering pressure and return hoses and/or steering gear are disconnected, the power steering pressure and return hoses and/or steering gear should be plugged to prevent system contamination. If the power steering system becomes contaminated with dirt or other foreign matter, power steering pump and/or steering gear failure may result. Installation 1. Position power steering pressure and return hoses to front sub-frame and secure with two bolts. Tighten bolts to 28 Nm (21 lb-ft). 2. Connect power steering pressure hose and power steering return hose unions to steering gear. Tighten unions to 31 Nm (23 lb-ft). 3. Install steering gear cover plate and secure with six bolts. Tighten bolts to 50 Nm (37 lb-ft). 4. Install front sub-frame. Refer to Section 02-01. 5. Lower vehicle. 6. Install power steering pump auxiliary reservoir as outlined. 7. On 2.5L engine, connect power steering pressure hose to front engine suppor t insulator and secure with one bolt. Tighten bolt to 6 Nm (53 lb-in). 8. On 2.0L engine, connect power steering pressure hose to power steering pump bracket and engine lifting bracket. Secure with one nut and two bolts. Tighten nut and bolts to 6 Nm (53 lb-in). 9. Install power steering pressure (PSP) switch into power steering pressure hose. 10. Connect power steering pressure (PSP) switch electrical connector. 11. Connect battery ground cable. 12. Refill power steering fluid as necessary and bleed system. Refer to Section 11-00. Hose Fittings, Pressure and Return Line at Steering Gear and Pump

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1. Raise the vehicle on a hoist. For additional information, refer to Section 100-02 . 2. Remove the front wheel and tire assemblies. For additional information, refer to Section 204-04 . 3. Disconnect the tie-rod ends. 1. Remove and discard the cotter pins. 2. Remove the castle nuts. 3. NOTE: Remove the adapter from the ball end of the tool and apply a small amount of grease to the tie-rod stud and to the ball of the tool. Use care not to damage the tie-rod dust boots when installing the tool. Disconnect the tie-rod ends from the front wheel spindles, using Tie-Rod End Remove TOOL-3290-D or equivalent. 4. Remove the left tie-rod end. 5. If equipped, remove the lower engine splash shield. 6. Remove the stabilizer bar. For additional information, refer to Section 204-01A . 7. Remove the nuts retaining the power steering cooler to the steering gear and position the cooler out of the way. 8. CAUTION: Clean any loose dirt from the valve portion of steering gear housing to prevent contamination of the power steering system. NOTE: Plug the ends of the fluid lines and ports to prevent entry of dirt. Disconnect and plug the power steering lines at the steering gear. 1. Disconnect the pressure line. 2. Disconnect the return line. 9. NOTE: Do not rotate the steering column while the intermediate shaft is disconnected or damage to the steering column clock spring will result. Remove the bolt retaining the lower steering column shaft to the steering gear input shaft. Disconnect the lower steering column shaft.

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CAUTION: When repairing the power steering system, care should be taken to prevent the entry of contaminants or premature failure of the power steering components can result. 1. Turn the wheel to the straight-ahead position and turn the ignition switch to the OFF position. 2. Remove the wheel and tire assemblies. For additional information, refer to Section 204-04. 3. Disconnect the power steering return hose at the power steering fluid cooler. Drain the fluid into a suitable container. 4. Remove the power steering fluid cooler to crossmember nuts. 5. Disconnect the power steering return hose and remove the power steering fluid cooler. 6. Loosen the tie-rod end jam nuts. 7. Remove and discard the cotter pins and nuts. 8. CAUTION: Do not damage the tie-rod boot when installing the special tool. NOTE: Remove the adapter from the ball end of the special tool. Apply a small amount of grease to the tie-rod end stud and the ball of the special tool. Using the special tool, separate the tie-rod ends from the wheel knuckles. 9. Remove the tie-rod ends. Count and record the number of turns required to remove the tie-rod end. 10. Remove the front stabilizer bar link nuts from the front suspension lower arms. 11. Remove the front stabilizer bar bolts and the front stabilizer bar links. 12. Remove the front stabilizer bar. 1. Remove the four bolts and two brackets. 2. Remove the front stabilizer bar. 3. Remove the stabilizer bar insulators.

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Steering Vibration/Shudder/Moan During Parking Maneuvers on Dry Pavement (Install Power Steering Pressure (Inlet) and/or Return (Outlet) Hose Assembly) 1995-99 Buick Riviera 1997-2001 Buick Park Avenue, Ultra 2000-2001 Buick LeSabre 2000-2001 Pontiac Bonneville steering vibration, shudder or moan noise when steering during parking maneuvers on dry pavement. Correction Install a new power steering pressure (inlet) hose assembly on the following vehicles: • 1995-98 Buick Riviera • 1997-98 Buick Park Avenue and Ultra Install a new power steering pressure (inlet) and return (outlet) hose assembly on the following vehicles: • 1999 Buick Riviera • 1999-2001 Buick Park Avenue and Ultra • 2000-2001 Buick LeSabre • 2000-2001 Pontiac Bonneville 1. Verify that the power steering pump reservoir is full. • If fluid level is low, fill and check for leaks. • If power steering system has air in the system, perform the “Bleeding Air from Power Steering System” procedure as described in the Power Steering System sub-section of the Service Manual. Important: When performing the “Bleeding Air from Power Steering System” procedure, it is important that the front of the vehicle is supported by the lower control arms. If the vehicle is not supported by the lower control arms, the procedure may cause the strut bushing to dislocate and cause new concern. Verify that the accessory drive belt is in good condition and that the pulleys are not bent or damaged. Verify proper belt tension and operation of the belt tensioner. Check for power steering hose ground out conditions. Check for good engine idle and correct engine RPM. Check to see that the rear transaxle mount does not have a plastic assembly aid installed which is used 2. 3. 4. 5. 6.

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high/erratic idle and/or the MIL light on. In some cases, vacuum leak noise may be heard as well. There may be poor contact or loss of contact at various main ground points or electrical connections. Power steering pressure switch may be shorted with debris. Inlet manifold gasket may be leaking. Broadcast code and calibration part number may need to be updated. To correct this condition, follow the procedures outlined in this bulletin to determine proper diagnosing, inspection and correction of ground contact points for proper electrical contact, power steering pressure switch cleaning or replacement and power steering system flush, replacement of inlet manifold gasket, and/or PCM reprogramming. SERVICE PROCEDURE Please refer to the appropriate workshop manual for the correct diagnosing procedure and/or follow the service procedures outlined in this bulletin for the vehicle being serviced. 1. Inspect main ground points (refer to SB99-04-S001 for more information). P6 ground point-body [on the passenger side of engine compartment, between the battery and cruise control actuator (if equipped)]. (Figure Fig. 1 ) P10 ground point-engine (at the alternator bracket). (Figure Fig. 2 ) The 1998, 1999 or 2000 Rodeo/Amigo Electrical Troubleshooting Manual can assist in locating the vehicle ground distribution (i.e., ground contact points). Perform a voltage drop test at the main ground points. If the voltage drop test fails, then inspect and clean both the bolt and