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Power Steering System Cadillac STS I

Manual & Power Steering 7 illustrations ~5760 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Air Cleaner Assembly front half screws8 N.m71 lb in
Brake Line to Brake Hose Fitting27 N.m20 lb ft
Intermediate Steering Shaft Pinch Bolt50 N.m37 lb ft
Lower Engine Mount Nuts to Frame80 N.m59 lb ft
Outer Tie Rod to Knuckle Retaining Nut70 N.m52 lb ft
Power Steering Cooler Pipe/Hose to Frame Retaining Bolt4 N.m35 lb in
Power Steering Cooler to Bracket Retaining Bolts9 N.m80 lb in
Power Steering Gear Retaining Bolts180 N.m134 lb ft
Power Steering Hoses to Power Steering Gear Retaining Bolt23 N.m17 lb ft
Power Steering Pressure Hose to Frame Retaining Bolts4 N.m40 lb in
Power Steering Pressure Hose to Power Steering Pump40 N.m30 lb ft
Power Steering Pump Bracket to Engine Bolt50 N.m37 lb ft
Power Steering Pump to Engine Bolt50 N.m37 lb ft
Power Steering Pump to Power Steering Bracket Bolt25 N.m18 lb ft
Power Steering Reservoir Retaining Nuts9 N.m80 lb in
Power Steering Return Line to Frame Retaining Bolt.4 N.m40 lb in

Fastener Tightening Specifications

Power Steering Pump Specifications

Engine CodeEngine SizeHigh FlowPressure Relief
LPMGPMKPaPSI
LY73.6L10.75/12.252.84/3.2411500/122001668/1770
LH24.6L10.75/12.252.84/3.2411500/122001668/1770

Power Steering Pump Specifications

Begin the system diagnosis by reviewing the system Description and Operation. Reviewing the Description and Operation information will help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the Description and Operation information will also help you determine if the condition described by the customer is normal operation. Refer to Symptoms - Power Steering System in order to identify the correct procedure for diagnosing the system and where the procedure is located.

IMPORTANTReview the system description and operation in order to familiarize yourself with the system functions. Refer to Power Steering System Description and Operation (w/o Electro-Hydraulic Steering) .

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the power steering system.
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
  3. Inspect the power steering reservoir for the proper power steering fluid level and condition.

Symptoms List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. «Power Steering Fluid Leaks»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__power-steering-fluid-leaks)
  2. «Rattle, Clunk, or Shudder Noise from the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system)
  3. «Whine or Growl Noise from the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system)
  4. «Steering Effort Hard in One or Both Directions»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__steering-effort-hard-in-one-or)
  5. «Steering Effort Too Easy in One or Both Directions»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__steering-effort-too-easy-in-one)

Scheme 1

Scheme 1: Power Steering System Test Procedure
Scheme 1: Power Steering System Test Procedure
CalloutComponent Name
1Power Steering Return Hose
2Power Steering Pressure Hose

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 5: This step tests the system for restrictions.
  2. 7: This step tests the following components for the following conditions: The pump for internal leaks The power steering pipes for kinks
  3. 8: This step tests the ability of the pump to regulate flow at maximum pressure.
  4. 10: This step tests the ability of the pump to regulate flow under normal operating conditions.
  5. 12: This step tests the internal components of the pump and the gear.
StepActionValue(s)YesNo
DEFINITION: The Power Steering System Test Procedure will perform the following functions: Test the operation of the hydraulic power steering system. Test the operation of the power steering pump and power steering gear. Identify restrictions in the system.
1Inspect the power steering fluid for the following indications of contamination: Milky fluid - water Brown fluid - burnt Debris in fluid - plastic or dirt Is the fluid free of contamination?Go to Step 3Go to Step 2
2Flush the power steering system. Refer to Flushing the Power Steering System . Did you complete the procedure?Go to Step 3
3IMPORTANT: In order to accurately diagnose the system, the malfunction must be present during the test procedure. Attempt to duplicate the condition.Is the condition present?Go to Step 4System OK
4Turn the ignition switch to the OFF position. Place a drain pan under the vehicle in order to catch any power steering fluid. Disconnect the power steering pressure pipe/hose from the power steering pump or the power steering gear as necessary. Install the J 44721 Power Steering System Analyzer. See Special Tools . Fill the power steering system. Refer to Checking and Adding Power Steering Fluid . Did you complete the installation?Go to Step 5
5Fully open the J 44721 valve. See Special Tools . Start the engine. NOTE: Refer to Steering Wheel in the Full Turn Position Notice in Cautions and Notices. Turn the steering wheel and BRIEFLY hold the steering wheel against the steering stop in order to release any trapped air from the system. Inspect and ensure that all of the power steering pipe/hose connections are not leaking. Making sure the steering wheel is OFF the steering stop, observe the pressure reading. Is the pressure reading greater than the specified value?1379 kPa (200 psi)Go to Step 6Go to Step 7
6IMPORTANT: A restriction may be present in the power steering system. Turn off the engine IMMEDIATELY. Locate and repair the restriction.Did you complete the repair?Go to Step 15
7Allow the engine to run until the engine reaches full operating temperature. Record the pressure reading and flow reading. Partially close the J 44721 valve until the system pressure reaches the specified value, then record the FLOW reading. See Special Tools . Subtract second flow reading from the first flow reading. Is the flow DECREASE greater than 3.8 L (1 gal) per minute?4827 kPa (700 psi)Go to Step 11Go to Step 8
8IMPORTANT: Do not leave the valve closed for more than 5 seconds, or internal pump damage could accrue. Fully close then open the J 44721 valve 3 times. See Special Tools . Record all of the high pressure readings. Refer to Power Steering Pump Specifications for power steering system pressure relief specifications.Are the three high pressure readings within specifications?Go to Step 9Go to Step 13
9Are the three high pressure readings within 245 kPa (50 psi) of each other?Go to Step 10Go to Step 13
10Increase the engine speed to approximately 1500 RPM. Record the flow reading. Refer to Power Steering Pump Specifications for power steering system pressure specifications. Is the actual flow reading within specifications?Go to Step 11Go to Step 13
11Is the difference between the actual flow reading and the maximum flow specification more than 3.8 L (1 gal) per minute?Go to Step 13Go to Step 12
12NOTE: The wheels of the vehicle must be straight ahead and the steering column in the LOCK position before disconnecting the steering column or intermediate shaft from the steering gear. Failure to do so will cause the coil assembly in the steering column to become uncentered which will cause damage to the coil assembly. Turn the steering wheel from steering stop to steering stop and record the FLOW readings at each stop.Is the flow LOWER than 3.8 L (1 gal) per minute?Go to Step 15Go to Step 14
13Replace the power steering pump. Refer to Power Steering Pump Replacement (LH2) or Power Steering Pump Replacement (LY7) . Did you complete the replacement?Go to Step 15
14The power steering gear is leaking across the piston or bypassing the valve circuit. Replace the power steering gear. Refer to Power Steering Gear Replacement . Did you complete the replacement?Go to Step 15
15Test the power steering system for the original condition. Does the original condition still exist?Go to Step 5Go to Step 16
16Disconnect and remove the J 44721 from the vehicle. See Special Tools . Connect the vehicle power steering pipes/hoses. Fill the power steering system. Refer to Checking and Adding Power Steering Fluid . Did you complete the procedure?System OK
IMPORTANT
In order to accurately diagnose the system, the malfunction must be present during the test procedure.
NOTE
Refer to Steering Wheel in the Full Turn Position Notice in Cautions and Notices.
IMPORTANT
A restriction may be present in the power steering system. Turn off the engine IMMEDIATELY.
IMPORTANT
Do not leave the valve closed for more than 5 seconds, or internal pump damage could accrue.
NOTE
The wheels of the vehicle must be straight ahead and the steering column in the LOCK position before disconnecting the steering column or intermediate shaft from the steering gear. Failure to do so will cause the coil assembly in the steering column to become uncentered which will cause damage to the coil assembly.

Power Steering System Test Procedure

Power Steering Fluid Leaks

StepActionYesNo
1Did you review the Power Steering System General Description and perform the necessary inspections?Go to Step 2Go to Symptoms - Power Steering System
2Verify that power steering fluid leaks are present. Is the power steering system leaking?Go to Step 3System OK
3Inspect the power steering system fittings. Are the fittings leaking?Go to Step 8Go to Step 4
4Inspect the power steering hoses. Are the hoses leaking?Go to Step 11Go to Step 5
5Inspect the power steering pump and the reservoir for leaks. Is the power steering pump or reservoir leaking?Go to Step 10Go to Step 6
6Inspect the power steering gear for leaks. Is the power steering gear leaking?Go to Step 11Go to Step 7
7Inspect the power steering cooler for leaks. Is the power steering cooler leaking?Go to Step 12Go to Step 3
8NOTE: Refer to Fastener Notice in Cautions and Notices. Tighten the fittings. Refer to Fastener Tightening Specifications .Did you complete the repair?Go to Step 13
9Replace the power steering hoses. Refer to the appropriate procedures: Power Steering Reservoir Outlet Pipe/Hose Replacement (LH2) or Power Steering Reservoir Outlet Pipe/Hose Replacement (LY7) Power Steering Gear Inlet Pipe/Hose Replacement (LH2) or Power Steering Gear Inlet Pipe/Hose Replacement (LY7) Power Steering Gear Outlet Pipe/Hose Replacement Power Steering Cooler Pipe/Hose Replacement Power Steering Reservoir Inlet Pipe/Hose Replacement (LH2) or Power Steering Reservoir Inlet Pipe/Hose Replacement (LY7) Did you complete the repair?Go to Step 13
10Replace the power steering pump or reservoir. Refer to Power Steering Pump Replacement (LH2) or Power Steering Pump Replacement (LY7) or Remote Power Steering Fluid Reservoir Replacement (LH2) or Remote Power Steering Fluid Reservoir Replacement (LY7) . Did you complete the repair?Go to Step 13
11Replace the power steering gear. Refer to Power Steering Gear Replacement . Did you complete the repair?Go to Step 13
12Replace the power steering cooler. Refer to Power Steering Cooler Replacement (LY7 W/O V92) or Power Steering Cooler Replacement (LH2 or LY7 with V92) . Did you complete the repair?Go to Step 13
13Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 3
NOTE
Refer to Fastener Notice in Cautions and Notices.

Power Steering Fluid Leaks

StepActionYesNo
1Did you review the Power Steering System General Description and perform the necessary inspections?Go to Step 2Go to Symptoms - Power Steering System
2Verify that a rattle, clunk or shudder noise is present. Is a rattle, clunk or shudder noise present?Go to Step 3System OK
3Inspect the power steering hoses for proper routing and clearance. Is the routing or clearance of the power steering hoses incorrect?Go to Step 10Go to Step 4
4Inspect the engine drive belt for cracking or excessive wear. Refer to Symptoms - Engine Mechanical in Engine Mechanical - 3.6L (LY7) or Symptoms - Engine Mechanical in Engine Mechanical - 4.6L (LH2). Is the drive belt cracked or excessively worn?Go to Step 11Go to Step 5
5Inspect the power steering pump pulley for damage. Is the power steering pump pulley damaged?Go to Step 12Go to Step 6
6Inspect the power steering pump for the proper installation. Refer to Power Steering Pump Replacement (LH2) or Power Steering Pump Replacement (LY7) . Is the power steering pump installation incorrect?Go to Step 13Go to Step 7
7Inspect the power steering gear for the proper installation. Refer to Power Steering Gear Replacement . Is the power steering gear installation incorrect?Go to Step 14Go to Step 8
8Inspect the suspension. Is the suspension worn?Go to Step 15Go to Step 9
9Inspect the intermediate shaft. Is the intermediate shaft worn?Go to Step 16Go to Step 3
10Adjust or replace the hoses. Refer to the appropriate procedures: Power Steering Reservoir Outlet Pipe/Hose Replacement (LH2) or Power Steering Reservoir Outlet Pipe/Hose Replacement (LY7) Power Steering Gear Inlet Pipe/Hose Replacement (LH2) or Power Steering Gear Inlet Pipe/Hose Replacement (LY7) Power Steering Gear Outlet Pipe/Hose Replacement Power Steering Reservoir Inlet Pipe/Hose Replacement (LH2) or Power Steering Reservoir Inlet Pipe/Hose Replacement (LY7) Power Steering Cooler Pipe/Hose Replacement Did you complete the repair?Go to Step 17
11Replace the engine drive belt. Refer to Drive Belt Replacement - Generator and Water Pump and Drive Belt Replacement - Generator and Water Pump in Engine Mechanical - 3.6L (LY7) or Drive Belt Replacement - Generator and Drive Belt Replacement - Air Conditioning, Power Steering and Water Pump in Engine Mechanical - 4.6L (LH2). Did you complete the repair?Go to Step 17
12Replace the power steering pump pulley. Refer to Power Steering Pulley Replacement . Did you complete the repair?Go to Step 17
13Install the power steering pump correctly. Refer to Power Steering Pump Replacement (LH2) or Power Steering Pump Replacement (LY7) . Did you complete the repair?Go to Step 17
14Install the power steering gear correctly. Refer to Power Steering Gear Replacement . Did you complete the repair?Go to Step 17
15Replace the worn suspension components. Refer to Diagnostic Starting Point - Suspension General Diagnosis in Suspension General Diagnosis. Did you complete the repair?Go to Step 17
16Replace the intermediate shaft. Refer to Intermediate Steering Shaft Replacement - Upper , Intermediate Steering Shaft Replacement - Center or Intermediate Steering Shaft Replacement - Lower . Did you complete the repair?Go to Step 17
17Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 3

Rattle, Clunk, or Shudder Noise from the Power Steering System

StepActionYesNo
1Did you review the Power Steering System Description and perform the necessary inspections?Go to Step 2Go to Symptoms - Power Steering System
2Verify that a whine or growl noise is present. Is a whine or growl noise present?Go to Step 3System OK
3Perform the power steering test procedure in order to diagnose a hydraulic condition and repair or replace a component. Refer to Power Steering System Test Procedure . Did you repair or replace a power steering system component?Go to Step 10Go to Step 4
4Using the J 39570 Chassis Ear, inspect the power steering gear for a whine or growl noise. Is the noise present at the power steering gear?Go to Step 7Go to Step 5
5Using the J 39570 , inspect the power steering pump for a whine or growl noise. Is the noise present at the power steering pump?Go to Step 8Go to Step 6
6Using the J 39570 , inspect the power steering hoses for a whine or growl noise. Is the noise present at the power steering hoses?Go to Step 9Go to Step 2
7Replace the power steering gear. Refer to Power Steering Gear Replacement . Did you complete the repair?Go to Step 10
8Replace the power steering pump. Refer to Power Steering Pump Replacement (LH2) or Power Steering Pump Replacement (LY7) . Did you complete the repair?Go to Step 10
9Adjust the routing of the power steering hoses. Did you complete the repair?Go to Step 10
10Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 3

Whine or Growl Noise from the Power Steering System

Steering Effort Hard in One or Both Directions

StepActionYesNo
1Did you review the Power Steering System General Description and perform the necessary inspections?Go to Step 2Go to Symptoms - Power Steering System
2Verify that the steering effort is hard in one or both directions. Does the system operate normally?System OKGo to Step 3
3Perform the power steering test procedure. Refer to Power Steering System Test Procedure . Did you complete the procedure?Go to Step 4
4Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 3

Steering Effort Hard in One or Both Directions

Steering Effort Too Easy in One or Both Directions

StepActionYesNo
1Did you review the Power Steering System Description and perform the necessary inspections?Go to Step 2Go to Symptoms - Power Steering System
2Verify that the steering effort is too easy in one or both directions. Does the system operate normally?System OKGo to Step 3
3Perform the power steering test procedure. Refer to Power Steering System Test Procedure . Did you complete the procedure?Go to Step 4
4Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 3

Steering Effort Too Easy in One or Both Directions

Tools Required

  1. J 35555 Metal Mityvac. See «Special Tools»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__special-tools) .
  2. J 43485 Power Steering Bleeder Adapter. See «Special Tools»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__special-tools) .
  1. Verify that the hoses do not touch any other part of the vehicle.
  2. Verify that all hose connections are tight.
  3. Remove the pump reservoir cap.
  4. Fill the pump reservoir with fluid to the FULL COLD level.
  5. Attach the J 43485 to the J 35555 or equivalent. See «Special Tools»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__special-tools) .
  6. Place the J 43485 on or in the pump reservoir filler neck. See «Special Tools»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__special-tools) .
  7. Apply a vacuum of 68 kPa (20 in Hg) maximum.
  8. Wait 5 minutes. Typical vacuum drop is 7-10 kPa (2-3 in Hg). If the vacuum does not remain steady, refer to Excessive Vacuum Drop Diagnosis at the end of this procedure.
  9. Remove the J 43485 and the J 35555 . See «Special Tools»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__special-tools) .
  10. Reinstall the pump reservoir cap.
  11. Start the engine. Allow the engine to idle.
  12. Turn off the engine.
  13. Verify the fluid level. Repeat steps 11-13 until the fluid stabilizes.
  14. Start the engine. Allow the engine to idle.
  15. Turn the steering wheel 180-360 degrees in both directions 5 times.
  16. Switch the ignition off.
  17. Verify the fluid level.
  18. Remove the pump reservoir cap.
  19. Attach the J 43485 to the J 35555 or equivalent. See «Special Tools»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__special-tools) .
  20. Place the J 43485 on or in the pump reservoir filler neck. See «Special Tools»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__special-tools) .
  21. Apply a vacuum of 68 kPa (20 in Hg) maximum.
  22. Wait 5 minutes.
  23. Remove the J 43485 and the J 35555 . See «Special Tools»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__special-tools) .
  24. Verify the fluid level.
  25. Reinstall the pump reservoir cap.

Excessive Vacuum Drop Diagnosis

  1. If the vacuum continues to drop, remove the pressure and return hose from the pump.
  2. Install the plugs (1,2) supplied with the J 43485 into the pressure and return port. See «Special Tools»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__special-tools) .
  3. Attach the J 43485 to the J 35555 or equivalent. See «Special Tools»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__special-tools) .
  4. Place the J 43485 on or in the pump reservoir filler neck. See «Special Tools»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__special-tools) .
  5. Apply a vacuum of 68 kPa (20 in Hg) maximum.
  6. If the vacuum drops again, repair or replace the pump. If the vacuum holds steady, continue to check the other parts of the steering system.
  7. Observe the fluid.
  8. If condition persists, replace the following parts: The return hose clamps The return hose O-rings The pressure hose O-rings The gear cylinder line O-rings The reservoir to pump O-ring
  9. Repeat the bleed procedure from the beginning.
  10. Drive the vehicle approximately 16 km (10 mi) in order to warm the system to operating temperature. Evaluate vehicle on a smooth flat surface.
  11. Verify the following conditions: There is smooth power assist. The vehicle operates quietly. The pump maintains the proper fluid level. There is not any leaking in the steering system. The fluid is free of foam or discoloration.

Checking and Adding Power Steering Fluid

Note. When adding fluid or making a complete fluid change, always use the proper power steering fluid. Failure to use the proper fluid will cause hose and seal damage and fluid leaks.

  1. Clean the area surrounding the reservoir cap.
  2. Remove the reservoir cap.
  3. Inspect the power steering pump fluid level at regular intervals. Use the appropriate procedure below. Add fluid when required. Refer to «Fluid and Lubricant Recommendations»(/cadillac/sts/i-2004-2007/remont/lubrication-system/#maintenance-and-lubrication__fluid-and-lubricant-recommendations) in Maintenance and Lubrication. Fluid Is Hot Run the engine until the fluid reaches about 80°C (170°F). Turn the engine OFF. Remove the reservoir cap. Inspect the fluid level on the capstick. Ensure that the fluid level is at the HOT/FULL mark on the capstick.
  4. If the fluid level is low, add power steering fluid to the proper level.
  5. Install the reservoir cap.
  6. When checking the fluid level after servicing the steering system, bleed the air from the system. Refer to «Bleeding the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
IMPORTANTDo not reuse any drained power steering fluid regardless of appearance or condition.
  1. Turn off the engine.
  2. Raise the front end of the vehicle off the ground until the tires and wheels turn freely. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2004-2007/remont/hoistjack/#general-information) in General Information.
  3. Place a large container under the fluid return hose in order to collect the draining fluid.
  4. Remove the fluid return hose at the power steering pump reservoir inlet connection.
  5. Plug the reservoir return hose inlet connection on the power steering pump.
  6. Run the engine at idle while an assistant maintains the fluid level at FULL COLD in the reservoir using new approved power steering fluid.
  7. Turn off the engine.
  8. Turn the steering wheel fully to the left and to the right.
  9. Remove the plug from the pump reservoir inlet connection.
  10. Install the fluid return hose to the pump reservoir.
  11. Maintain the fluid level at FULL COLD.
  12. Operate the engine at idle for approximately 15 minutes.
  13. Repeat steps 3-5.
  14. Inspect the power steering fluid for the following indications of contamination: Milky fluid - water Brown fluid - burnt Plastic debris or dirt chunks
  15. If the fluid is contaminated, repeat steps 6-12 in order to complete a third flush.
  16. Remove the plug from the pump reservoir inlet connection.
  17. Install the fluid return hose to the pump reservoir.
  18. Clean any spilled fluid.
  19. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system)

Removal Procedure

  1. Remove the air cleaner intake duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-46l-lh2-introduction) in Engine Controls - 4.6L (LH2).
  2. Remove the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  3. Place a drain pan under the vehicle.
  4. Disconnect the power steering cooler hose from the power steering reservoir.
  5. Disconnect the power steering reservoir outlet hose from the power steering reservoir.
  6. Remove the power steering reservoir retaining nuts.
  7. Remove the power steering reservoir from the vehicle.

Installation Procedure

  1. Install the power steering reservoir to the vehicle.
  2. Install the power steering reservoir retaining nuts. Tighten: Tighten the nuts to 9 N.m (80 lb in).
  3. Connect the power steering reservoir outlet hose to the power steering reservoir.
  4. Connect the power steering cooler hose to the power steering reservoir.
  5. Remove the drain pan from under the vehicle.
  6. Install the air cleaner intake duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-46l-lh2-introduction) in Engine Controls - 4.6L (LH2).
  7. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  8. Install the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/sts/i-2004-2007/remont/mechanical/#engine-mechanical-36l-ly7-2-of-6) in Engine Mechanical - 3.6L (LY7).
  2. Remove the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  3. Place a drain pan under the vehicle.
  4. Disconnect the power steering cooler hose from the power steering reservoir.
  5. Disconnect the power steering reservoir outlet hose from the power steering reservoir.
  6. Remove the power steering reservoir retaining bolts.
  7. Remove the power steering reservoir from the vehicle.
  1. Install the power steering reservoir to the vehicle.
  2. Install the power steering reservoir retaining bolts. Tighten: Tighten the bolts to 9 N.m (80 lb in).
  3. Connect the power steering reservoir outlet hose to the power steering reservoir.
  4. Connect the power steering cooler hose to the power steering reservoir.
  5. Remove the drain pan from under the vehicle.
  6. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  7. Install the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  8. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/sts/i-2004-2007/remont/mechanical/#engine-mechanical-36l-ly7-2-of-6) in Engine Mechanical - 3.6L (LY7).

Power Steering Pulley Replacement

Tools Required

  1. J 25033-C Pulley Installer
  2. J 25034-C Pulley Remover
  1. Remove the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-36l-ly7-introduction) in Engine Controls - 3.6L (LY7) or «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-46l-lh2-introduction) in Engine Controls - 4.6L (LH2).
  2. Remove the drive belt. Refer to «Drive Belt Replacement - Power Steering and Air Conditioning»(/cadillac/sts/i-2004-2007/remont/mechanical/#engine-mechanical-36l-ly7-2-of-6) in Engine Mechanical - 3.6L (LY7) or «Drive Belt Replacement - Air Conditioning, Power Steering and Water Pump»(/cadillac/sts/i-2004-2007/remont/mechanical/#engine-mechanical-46l-lh2-2-of-6) in Engine Mechanical - 4.6L (LH2).
  3. Using the J 25034-C , remove the power steering pump pulley from the power steering pump.
  1. Using the J 25033-C , install the power steering pump pulley to the power steering pump.
  2. Ensure that the axial tolerance of the power steering pulley on the power steering pump is within 0.25 mm (0.010 in).
  3. Install the drive belt. Refer to «Drive Belt Replacement - Power Steering and Air Conditioning»(/cadillac/sts/i-2004-2007/remont/mechanical/#engine-mechanical-36l-ly7-2-of-6) in Engine Mechanical - 3.6L (LY7) or «Drive Belt Replacement - Air Conditioning, Power Steering and Water Pump»(/cadillac/sts/i-2004-2007/remont/mechanical/#engine-mechanical-46l-lh2-2-of-6) in Engine Mechanical - 4.6L (LH2).
  4. Install the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-36l-ly7-introduction) in Engine Controls - 3.6L (LY7) or «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-46l-lh2-introduction) in Engine Controls - 4.6L (LH2).
  1. Remove the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  2. Remove the power steering pulley. Refer to «Power Steering Pulley Replacement»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__power-steering-pulley-replacement) .
  3. Place a drain pan under the vehicle.
  4. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-46l-lh2-introduction) in Engine Controls - 4.6L (LH2).
  5. Disconnect the power steering reservoir outlet hose from the power steering pump.
  6. Disconnect the power steering pressure hose from the power steering pump.
  7. Remove the power steering pump to engine mounting bolt.
  8. Remove the power steering bracket to the engine bolts.
  9. Remove the power steering pump with bracket from the vehicle.
  10. Remove the power steering pump to power steering bracket. Refer to «Power Steering Pump Bracket Replacement (LH2)»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) or «Power Steering Pump Bracket Replacement (LY7)»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  1. Install the power steering pump to power steering bracket. Refer to «Power Steering Pump Bracket Replacement (LH2)»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) or «Power Steering Pump Bracket Replacement (LY7)»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  2. Install the power steering pump with bracket to the vehicle.
  3. Install the power steering bracket to the engine bolts. Tighten: Tighten the bolt to 50 N.m (37 lb ft).
  4. Install the power steering pump to the engine mounting bolt. Tighten: Tighten the bolt to 50 N.m (37 lb ft).
  5. Connect the power steering pressure hose to the power steering pump.
  6. Connect the power steering reservoir outlet hose to the power steering pump.
  7. Remove the drain pan from under the vehicle.
  8. Install the power steering pulley. Refer to «Power Steering Pulley Replacement»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__power-steering-pulley-replacement) .
  9. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-46l-lh2-introduction) in Engine Controls - 4.6L (LH2).
  10. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  11. Install the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  1. Remove the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  2. Remove the power steering pulley. Refer to «Power Steering Pulley Replacement»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__power-steering-pulley-replacement) .
  3. Place a drain pan under the vehicle.
  4. Remove the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-36l-ly7-introduction) in Engine Controls - 3.6L (LY7).
  5. Disconnect the power steering reservoir outlet hose from the power steering pump.
  6. Disconnect the power steering pressure hose from the power steering pump.
  7. Remove the power steering bracket to the engine mounting bolts (1, 2, and 3).
  8. Remove the power steering pump with bracket from the vehicle.
  9. Remove the power steering pump bracket from the power steering pump. Refer to «Power Steering Pump Bracket Replacement (LH2)»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) or «Power Steering Pump Bracket Replacement (LY7)»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  1. Install the power steering pump to the power steering pump bracket. Refer to «Power Steering Pump Bracket Replacement (LH2)»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) or «Power Steering Pump Bracket Replacement (LY7)»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  2. Install the power steering pump with bracket to the vehicle.
  3. Install the power steering pump bracket to the engine mounting bolts (1, 2 and 3). Tighten: Tighten the bolts in sequence to 50 N.m (37 lb ft).
  4. Connect the power steering pressure hose to the power steering pump.
  5. Connect the power steering reservoir outlet hose to the power steering pump.
  6. Remove the drain pan from under the vehicle.
  7. Install the power steering pulley. Refer to «Power Steering Pulley Replacement»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system__power-steering-pulley-replacement) .
  8. Install the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-36l-ly7-introduction) in Engine Controls - 3.6L (LY7).
  9. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  10. Install the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  1. Remove the power steering pump. Refer to «Power Steering Pump Replacement (LH2)»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) or «Power Steering Pump Replacement (LY7)»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  2. Remove the power steering pump to bracket bolts.
  3. Separate the power steering pump from the power steering bracket.
  1. Install the power steering pump to the power steering bracket.
  2. Install the Power steering pump to bracket bolts. Tighten: Tighten the bolts to 25 N.m (18 lb ft).
  3. Install the power steering pump. Refer to «Power Steering Pump Replacement (LH2)»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) or «Power Steering Pump Replacement (LY7)»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  1. Remove the power steering pump. Refer to «Power Steering Pump Replacement (LH2)»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) or «Power Steering Pump Replacement (LY7)»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  2. Remove the power steering pump to bracket bolts.
  3. Separate the power steering pump from the power steering pump bracket.
  1. Install the power steering pump to the power steering bracket.
  2. Install the Power steering pump to power steering pump bracket bolts. Tighten: Tighten the bolts to 25 N.m (18 lb ft).
  3. Install the power steering pump. Refer to «Power Steering Pump Replacement (LH2)»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) or «Power Steering Pump Replacement (LY7)»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .

Tools Required

J 24319-B Steering Linkage and Tie Rod Puller

  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2004-2007/remont/hoistjack/#general-information) in General Information.
  2. Remove the tire and wheel. Refer to «Tire and Wheel Removal and Installation»(/cadillac/sts/i-2004-2007/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  3. Loosen the outer tie rod jam nut (1).
  4. Remove the outer tie rod retaining nut.
  5. Using J 24319-B disconnect the outer tie rod from the steering knuckle.
  6. Remove the outer tie rod from the inner tie rod.
  1. Install the outer tie rod to the inner tie rod. Do not tighten the jam nut at this time.
  2. Connect the outer tie rod to the steering knuckle. Install the outer tie rod retaining nut. Tighten: Tighten the nut to 70 N.m (52 lb ft).
  3. Install the tire and wheel. Refer to «Tire and Wheel Removal and Installation»(/cadillac/sts/i-2004-2007/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  4. Lower the vehicle.
  5. Adjust the front toe. Refer to «Front Toe Adjustment»(/cadillac/sts/i-2004-2007/remont/wheel-alignment/#wheel-alignment-system__front-toe-adjustment) in Wheel Alignment.
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2004-2007/remont/hoistjack/#general-information) in General Information.
  2. Remove the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  3. Disconnect the power steering cooler pipe/hose from the power steering lines.
  4. Remove the power steering cooler pipe/hose to frame retaining bolt.
  5. Lower the vehicle.
  6. Disconnect the power steering cooler pipe/hose from the power steering cooler.
  7. Remove the power steering cooler pipe/hose from the vehicle.
  1. Position the power steering cooler pipe/hose to the vehicle.
  2. Connect the power steering cooler pipe/hose to the power steering cooler.
  3. Install the power steering cooler pipe/hose to frame retaining bolt. Tighten: Tighten the bolts to 4 N.m (35 lb in).
  4. Connect the power steering cooler pipe/hose to the power steering lines.
  5. Install the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  6. Lower the vehicle.
  7. Remove the drain pan from under the vehicle.
  8. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2004-2007/remont/hoistjack/#general-information) in General Information.
  2. Remove the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  3. Install a drain pan under the vehicle.
  4. Remove the power steering cooler bolts from the power steering cooler brackets.
  5. Disconnect the power steering lines from the power steering cooler.
  6. Remove the power steering cooler from the vehicle.
  1. Install the power steering cooler to the vehicle.
  2. Connect the power steering lines to the power steering cooler.
  3. Install the power steering cooler bolts to the power steering cooler brackets. Tighten: Tighten the bolts to 9 N.m (80 lb in).
  4. Remove the drain pan from under the vehicle.
  5. Install the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  6. Lower the vehicle.
  7. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2004-2007/remont/hoistjack/#general-information) in General Information.
  2. Remove the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  3. Install a drain pan under the vehicle.
  4. Remove the power steering cooler bolts from the power steering cooler brackets.
  5. Disconnect the power steering lines from the power steering cooler.
  6. Remove the power steering cooler from the vehicle.
  1. Install the power steering cooler to the vehicle.
  2. Connect the power steering lines to the power steering cooler.
  3. Install the power steering cooler bolts to the power steering cooler brackets. Tighten: Tighten the bolts to 9 N.m (80 lb in).
  4. Remove the drain pan from under the vehicle.
  5. Install the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  6. Lower the vehicle.
  7. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2004-2007/remont/hoistjack/#general-information) in General Information.
  2. Remove the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  3. Disconnect the power steering reservoir inlet hose from the power steering cooler.
  4. Remove the power steering reservoir inlet hose to frame retaining bolt.
  5. Lower the vehicle.
  6. Disconnect the power steering reservoir inlet hose from the power steering reservoir.
  7. Remove the power steering cooler pipe/hose from the vehicle.
  1. Position the power steering reservoir inlet hose to the vehicle.
  2. Connect the power steering reservoir inlet hose to the power steering reservoir.
  3. Install the power steering reservoir inlet hose to frame retaining bolt. Tighten: Tighten the bolts to 4 N.m (35 lb in).
  4. Connect the power steering reservoir inlet hose to the power steering cooler.
  5. Install the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  6. Lower the vehicle.
  7. Remove the drain pan from under the vehicle.
  8. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2004-2007/remont/hoistjack/#general-information) in General Information.
  2. Remove the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  3. Disconnect the power steering reservoir inlet hose from the power steering cooler.
  4. Remove the power steering reservoir inlet hose to frame retaining bolt.
  5. Lower the vehicle.
  6. Disconnect the power steering reservoir inlet hose from the power steering reservoir.
  7. Remove the power steering cooler pipe/hose from the vehicle.
  1. Position the power steering reservoir inlet hose to the vehicle.
  2. Connect the power steering reservoir inlet hose to the power steering reservoir.
  3. Install the power steering reservoir inlet hose to frame retaining bolt. Tighten: Tighten the bolts to 4 N.m (35 lb in).
  4. Connect the power steering reservoir inlet hose to the power steering cooler.
  5. Install the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  6. Lower the vehicle.
  7. Remove the drain pan from under the vehicle.
  8. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  1. Remove the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  2. Place a drain pan under the vehicle.
  3. Remove the air cleaner intake duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-46l-lh2-introduction) in Engine Controls - 4.6L (LH2).
  4. Disconnect the power steering reservoir outlet hose from the power steering pump.
  5. Disconnect the power steering reservoir outlet hose from the power steering reservoir.
  6. Remove the power steering reservoir outlet hose.
  1. Connect the power steering reservoir outlet hose to the power steering reservoir.
  2. Connect the power steering reservoir outlet hose to the power steering reservoir.
  3. Install the air cleaner intake duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-46l-lh2-introduction) in Engine Controls - 4.6L (LH2).
  4. Remove the drain pan from under the vehicle.
  5. Install the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  6. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  1. Remove the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  2. Place a drain pan under the vehicle.
  3. Remove the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-36l-ly7-introduction) in Engine Controls - 3.6L (LY7).
  4. Disconnect the power steering reservoir outlet hose from the power steering pump.
  5. Disconnect the power steering reservoir outlet hose from the power steering reservoir.
  6. Remove the power steering reservoir outlet hose.
  1. Connect the power steering reservoir outlet hose to the power steering reservoir.
  2. Connect the power steering reservoir outlet hose to the power steering reservoir.
  3. Install the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-36l-ly7-introduction) in Engine Controls - 3.6L (LY7).
  4. Remove the drain pan from under the vehicle.
  5. Install the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  6. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  1. Remove the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  2. Place a drain pan under the vehicle.
  3. Remove the air cleaner intake duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-46l-lh2-introduction) in Engine Controls - 4.6L (LH2).
  4. Loosen the air cleaner assembly front half retaining screws.
  5. Remove the air cleaner assembly front half.
  6. Disconnect the power steering gear inlet hose fitting from the power steering pump.
  7. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2004-2007/remont/hoistjack/#general-information) in General Information.
  8. Remove the power steering gear inlet hose to the frame mounting bolts.
  9. Remove the power steering gear inlet hose to power steering gear retaining bolt.
  10. Remove the power steering gear inlet hose from the power steering gear.
  11. Remove the power steering hose from the vehicle.
  1. Install the power steering hose to the vehicle.
  2. Install the power steering gear inlet hose to power steering gear retaining bolt. Tighten: Tighten the bolt to 23 N.m (17 lb in).
  3. Install the power steering gear inlet hose to frame mounting bolts. Tighten: Tighten the bolts to 4 N.m (35 lb in).
  4. Install the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  5. Lower the vehicle.
  6. Connect the power steering gear inlet hose fitting to the power steering pump. Tighten: Tighten the fitting to 38 N.m (28 lb in)
  7. Install the power steering inlet hose quick connect to fitting.
  8. Install the air cleaner assembly front half. Tighten: Tighten the screws to 8 N.m (71 lb in).
  9. Install the air cleaner intake duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-46l-lh2-introduction) in Engine Controls - 4.6L (LH2).
  10. Remove the drain pan from under the vehicle.
  11. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  1. Remove the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  2. Place a drain pan under the vehicle.
  3. Remove the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-36l-ly7-introduction) in Engine Controls - 3.6L (LY7).
  4. Loosen the air cleaner assembly front half retaining screws.
  5. Remove the air cleaner assembly front half.
  6. Remove the power steering gear inlet hose fitting from the power steering pump.
  7. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2004-2007/remont/hoistjack/#general-information) in General Information.
  8. Remove the power steering gear inlet hose to the frame mounting bolts.
  9. Remove the power steering gear inlet hose to power steering gear retaining bolt.
  10. Remove the power steering gear inlet hose from the power steering gear.
  11. Remove the power steering hose from the vehicle.
  1. Install the power steering hose to the vehicle.
  2. Install the power steering gear inlet hose to the power steering gear.
  3. Install the power steering gear inlet hose to power steering gear retaining bolt. Tighten: Tighten the bolt to 23 N.m (17 lb in).
  4. Install the power steering gear inlet hose to frame mounting bolts. Tighten: Tighten the bolts to 4 N.m (35 lb in).
  5. Install the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  6. Lower the vehicle.
  7. Install the power steering gear inlet hose fitting to the power steering pump. Tighten: Tighten the fitting to 38 N.m (28 lb in).
  8. Install the power steering gear inlet hose quick connect to the fitting.
  9. Install the air cleaner assembly front half. Tighten: Tighten the screws to 8 N.m (71 lb in).
  10. Install the air cleaner intake duct. Refer to «Air Cleaner Intake Duct Replacement»(/cadillac/sts/i-2004-2007/remont/testing-diagnostics/#engine-control-system-36l-ly7-introduction) in Engine Controls - 3.6L (LY7).
  11. Remove the drain pan from under the vehicle.
  12. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2004-2007/remont/hoistjack/#general-information) in General Information.
  2. Remove the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  3. Place a drain pan under the vehicle.
  4. Remove the power steering gear outlet hose to frame retaining bolt.
  5. Disconnect the power steering gear outlet hose from the power steering cooler.
  6. Remove the power steering lines to power steering gear retaining bolt.
  7. Disconnect the power steering gear outlet hose from the power steering gear.
  8. Remove the power steering return line from the vehicle.
  1. Install the power steering gear outlet hose to the vehicle.
  2. Connect the power steering gear outlet hose to the power steering gear.
  3. Install the power steering hoses to power steering gear retaining bolt. Tighten: Tighten the bolt to 23 N.m (17 lb ft).
  4. Connect the power steering gear outlet hose to the power steering cooler.
  5. Install the power steering gear outlet hose to frame retaining bolt. Tighten: Tighten the bolt to 4 N.m (40 lb in).
  6. Remove the drain pan from under the vehicle.
  7. Install the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  8. Lower the vehicle.
  9. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .

Power Steering Gear Replacement

Tools Required

  1. J 24319-B Steering Linkage and Tie Rod Puller
  2. J 42640 Steering Column Anti-Rotation Pin
  1. Install the J 42640 to the steering column.
  2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/sts/i-2004-2007/remont/hoistjack/#general-information) in General Information.
  3. Remove the front tires and wheels. Refer to «Tire and Wheel Removal and Installation»(/cadillac/sts/i-2004-2007/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  4. Remove the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/sts/i-2004-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
  5. Remove the intermediate shaft lower pinch bolt.
  6. Disconnect the intermediate shaft from the power steering gear.
  7. Disconnect the variable effort steering harness connector.
  8. Remove the outer tie rod retaining nuts.
  9. Using the J 24319-B , separate the outer tie rod from the steering knuckles.
  10. Place a drain pan under the vehicle.
  11. Remove the power steering hoses to power steering gear retaining bolt.
  12. Disconnect the power steering hoses from the power steering gear.
  13. If equipped with the 4.6L (LH2) engine, perform the following steps: Disconnect the left brake line from the brake hose. Plug the brake line. Carefully position the brake line to the side.
  14. If equipped with AWD, using a suitable jack, support the bottom of the front differential housing.
  15. If equipped with AWD, loosen the right engine mount nut.
  16. If equipped with AWD, raise the differential housing to clear the steering rack bolt.
  17. Remove the power steering gear mounting bolts.
  18. If equipped with the 4.6L (LH2) engine, remove the left rearward lower control arm to frame mounting nut and bolt.
  19. Remove the power steering gear through the left wheel opening.
  1. Install the power steering gear through the left wheel opening.
  2. If equipped with the 4.6L (LH2) engine, install the left rearward lower control arm to frame mounting bolt and nut.
  3. Install the power steering gear retaining bolts. Tighten: Tighten the bolts to 180 N.m (134 lb ft).
  4. If equipped with AWD, lower the differential housing.
  5. If equipped with AWD, tighten the right lower engine mount to the frame nut. Tighten: Tighten the nut to 80 N.m (59 lb ft).
  6. If equipped with AWD, remove the support from the bottom of the differential housing.
  7. If equipped with the 4.6L (LH2) engine, install the left brake line to the brake hose. Tighten: Tighten the line to 27 N.m (20 lb in).
  8. Install the power steering hoses to the power steering gear.
  9. Install the power steering hoses to the power steering gear retaining bolt. Tighten: Tighten the bolt to 23 N.m (17 lb ft).
  10. Remove the drain pan from under the vehicle.
  11. Install the outer tie rod to the steering knuckles. Tighten: Tighten the nuts to 70 N.m (52 lb ft).
  12. Connect the variable effort steering harness connector.
  13. Connect the intermediate shaft to the power steering gear.
  14. Install the intermediate shaft lower pinch bolt. Tighten: Tighten the bolt to 50 N.m (37 lb ft).
  15. Install the tire and wheels. Refer to «Tire and Wheel Removal and Installation»(/cadillac/sts/i-2004-2007/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
  16. Lower the vehicle.
  17. Remove the J 42640 from the steering column.
  18. Bleed the power steering system. Refer to «Bleeding the Power Steering System»(/cadillac/sts/i-2004-2007/remont/manual-power-steering/#power-steering-system) .
  19. Adjust the front toe. Refer to «Front Toe Adjustment»(/cadillac/sts/i-2004-2007/remont/wheel-alignment/#wheel-alignment-system__front-toe-adjustment) in Wheel Alignment.

The hydraulic power steering pump is a constant displacement vane-type pump that provides hydraulic pressure and flow for the power steering gear. The hydraulic power steering pumps are either belt-driven or direct-drive, cam-driven.

The power steering fluid reservoir holds the power steering fluid and may be integral with the power steering pump or remotely located. The following locations are typical locations for the remote reservoir

  1. Mounted to the front of the dash panel
  2. Mounted to the inner fender
  3. Mounted to a bracket on the engine

The 2 basic types of power steering gears are listed below

  1. A recirculating ball system
  2. A rack and pinion system

In the recirculating ball system, a worm gear converts steering wheel movement to movement of a sector shaft. A pitman arm attached to the bottom of the sector shaft actually moves one tie rod and an intermediate rod move the other tie rod.

In the rack and pinion system, the rack and the pinion are the 2 components that convert steering wheel rotation to lateral movement. The steering shaft is attached to the pinion in the steering gear. The pinion rotates with the steering wheel. Gear teeth on the pinion mesh with the gear teeth on the rack. The rotating pinion moves the rack from side to side. The lateral action of the rack pushes and pulls the tie rods in order to change the direction of the vehicle's front wheels.

The power steering pressure hose connects the power steering pump union fitting to the power steering gear and allows pressurized power steering fluid to flow from the pump to the gear.

The power steering return hose returns fluid from the power steering gear back to the power steering fluid reservoir. The power steering return line may contain an integral fin-type or line-type power steering fluid cooler.

In a typical power steering system, a pump generates hydraulic pressure, causing fluid to flow, via the pressure hose, to the steering gear valve assembly. The steering gear valve assembly regulates the incoming fluid to the right and left chambers in order to assist in right and left turns.

Turning the steering wheel activates the valve assembly, which applies greater fluid pressure and flow to 1 side of the steering gear piston, and lower pressure and flow to the other side of the piston. The pressure assists the movement of the gear piston. Tie rods transfer this force to the front wheels, which turn the vehicle right or left.

Special Tools

Special Tools Illustration Tool Number/ Description J 22610 Keystone Clamp Pliers J 24319-B Steering Linkage and Tie Rod Puller J 25033-C Pulley Installer J 25034-C Pulley Remover J 35555 Metal Mity® Vac J 39570 Chassis Ear J 42640 Steering Column Anti-Rotation Pin J 43485 Power Steering Bleeder Adapter J 44721 Power Steering Analyzer

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Scheme 2: Special Tools
Scheme 2: Special Tools

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See also:
• Steering Wheel in the Full Turn Position Notice
• Fastener Notice
• Symptoms - Engine Mechanical
• Symptoms - Engine Mechanical
• Drive Belt Replacement - Generator and Water Pump
• Drive Belt Replacement - Generator
• Diagnostic Starting Point - Suspension General Diagnosis
• Intermediate Steering Shaft Replacement - Upper
• Fluid and Lubricant Recommendations
• Lifting and Jacking the Vehicle
• Air Cleaner Outlet Duct Replacement
• Air Deflector Replacement - Front
• Air Cleaner Intake Duct Replacement
• Tire and Wheel Removal and Installation
• Front Toe Adjustment
• Symptoms - Power Steering System
• Power Steering Fluid Leaks
• Steering Effort Hard in One or Both Directions
• Steering Effort Too Easy in One or Both Directions
• Special Tools
• Checking and Adding Power Steering Fluid
• Power Steering Pump Specifications
• Power Steering Gear Replacement
• Fastener Tightening Specifications
• Power Steering Pulley Replacement