Hummer H2. Manual — part 2113

WHINE OR GROWL NOISE FROM THE POWER STEERING SYSTEM

Whine or Growl Noise from the Power Steering System

STEERING EFFORT HARD IN ONE OR BOTH DIRECTIONS

Steering Effort Hard in One or Both Directions

Step

Action

Yes

No

1

Did you review the Power Steering System General Description
and perform the necessary inspections?

Go to

Step 2

Go to Symptoms -

Power Steering

System

2

Verify that a whine or growl noise is present.
Is a whine or growl noise present?

Go to

Step 3

System OK

3

Perform 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 .
Is there a hydraulic problem in the system?

Go to

Step 12

Go to Step 4

4

Inspect the power steering gear for a whine or growl noise using J
39570 .
Is the noise present at the power steering gear?

Go to

Step 8

Go to Step 5

5

Inspect the power steering pump for a whine or growl noise using
J 39570 .
Is the noise present at the power steering pump?

Go to

Step 9

Go to Step 6

6

Inspect the power steering hoses for a whine or growl noise using
J 39570 .
Is the noise present at the power steering hoses?

Go to

Step 10

Go to Step 7

7

Inspect the hydraulic brake booster for a whine or growl noise
using J 39570 .
Is the noise present at the hydro boost?

Go to

Step 11

Go to Step 3

8

Replace the power steering gear. Refer to Power Steering Gear
Replacement .
Did you complete the repair?

Go to

Step 12

-

9

Replace the power steering pump. Refer to Power Steering
Pump Replacement .
Did you complete the repair?

Go to

Step 12

-

10

Adjust the routing of the power steering hoses.
Did you complete the repair?

Go to

Step 12

-

11

Diagnose the hydraulic brake booster. Refer to Hydraulic Brake
Assist System Noise Inspection in Hydraulic Brakes.
Did you correct the condition?

Go to

Step 12

-

12

Operate the system in order to verify the repair.
Did you correct the condition?

System

OK

Go to Step 3

Step

Action

Yes

No

1

Did you review the Power Steering System General
Description and perform the necessary inspections?

Go to

Step 2

Go to Symptoms - Power

Steering System

2004 Hummer H2

2004 STEERING Power Steering System - Hummer H2

STEERING EFFORT TOO EASY IN ONE OR BOTH DIRECTIONS

Steering Effort Too Easy in One or Both Directions

REPAIR INSTRUCTIONS

BLEEDING THE POWER STEERING SYSTEM

Tools Required

z

J 35555 Metal Mity Vac. See Special Tools and Equipment .

z

J 43485 Power Steering Bleeder Adapter. See Special Tools and Equipment .

2

Verify that the steering effort is hard in one or both
directions.
Does the system operate normally?

System

OK

Go to Step 3

3

Perform the power steering test procedure. Refer to Power
Steering System Test Procedure .
Did you complete the procedure?

Go to

Step 4

-

4

Operate the system in order to verify the repair.
Did you correct the condition?

System

OK

Go to Step 3

Step

Action

Yes

No

1

Did you review the Power Steering System Description
and perform the necessary inspections?

Go to

Step 2

Go to Symptoms - Power

Steering System

2

Verify that the steering effort is too easy in one or both
directions.
Does the system operate normally?

System

OK

Go to Step 3

3

Perform the power steering test procedure. Refer to
Power Steering System Test Procedure .
Did you complete the procedure?

Go to

Step 4

-

4

Operate the system in order to verify the repair.
Did you correct the condition?

System

OK

Go to Step 3

NOTE:

If the power steering system has been serviced, an accurate fluid level reading
cannot be obtained unless air is bled from the steering system. The air in the
fluid may cause pump cavitation noise and may cause pump damage over a
period of time.

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.

IMPORTANT: Hoses touching the frame, body, or engine may cause system noise.

2004 Hummer H2

2004 STEERING Power Steering System - Hummer H2

1. Verify that the hoses do not touch any other part of the vehicle.

2. Verify that all hose connections are tight.

Fig. 4: Removing Pump Reservoir Cap
Courtesy of GENERAL MOTORS CORP.

3. Remove the pump reservoir cap.

IMPORTANT: Loose connections may not leak, but could allow air into the steering

system.

IMPORTANT: Maintain the fluid level throughout the bleed procedure.

IMPORTANT: Use clean, new power steering fluid only.

2004 Hummer H2

2004 STEERING Power Steering System - Hummer H2

4. Fill the pump reservoir with fluid to the FULL COLD level.

Fig. 5: Bleeding Power Steering System
Courtesy of GENERAL MOTORS CORP.

5. Attach the J 43485 to the J 35555 or equivalent. See Special Tools and Equipment .

6. Place the J 43485 on or in the pump reservoir filler neck. See Special Tools and Equipment .

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.

2004 Hummer H2

2004 STEERING Power Steering System - Hummer H2