Chevrolet Silverado / GMC Sierra. Service manual — part 2710

Steering Fluid (Without Hydroboost).

6. Start the engine. Rotate steering wheel from left to right. Check for sign of cavitation or

fluid aeration (pump noise/whining).

7. Verify the fluid level. Repeat the bleed procedure, if necessary.

CHECKING AND ADDING POWER STEERING FLUID (WITH HYDROBOOST)

1. If the power steering system has been serviced, bleed the power steering system to remove

any trapped air from the system. Refer to Power Steering System Bleeding.

2. Fully charge the hydro-boost accumulator using the following procedure:

1. Start the engine.

2. Firmly apply the brake pedal 2 to 3 times.

3. Turn the engine OFF.

3. Clean the area surrounding the reservoir cap.

4. Remove the reservoir cap.

5. Inspect the power steering pump fluid level at regular intervals.

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: The oil level will appear falsely high if the hydro-boost

accumulator is not fully charged. Do not apply the brake
pedal with the engine off, this will discharge the hydro-boost
accumulator.

IMPORTANT: The Add and Cold Full marks on the capstick are calculated

for oil at ambient temperature. If the oil is hot, the oil level
may appear slightly high.

IMPORTANT: The ideal oil level is between the Add and the Full Cold

marks. Since overfilling is just as undesirable as
underfilling, there is no reason to fill all the way up to the
Full Cold mark.

2008 Chevrolet Silverado 1500

2008 STEERING Power Steering - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Add fluid when required. Refer to Fluid and Lubricant Recommendations .

6. Install the reservoir cap.

7. When checking the fluid level after servicing the steering system, bleed the air from the

system. Refer to Power Steering System Bleeding.

CHECKING AND ADDING POWER STEERING FLUID (WITHOUT HYDROBOOST)

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 .

Fluid Is Cold

1. Remove the reservoir cap.

2. Inspect the fluid level on the capstick.

3. Ensure that the fluid level is between the bottom of the COLD/FULL mark and the end

of the capstick.

Fluid Is Hot

1. Run the engine until the fluid reaches about 80°C (170°F).

2. Turn the engine OFF.

3. Remove the reservoir cap.

4. Inspect the fluid level on the capstick.

5. Ensure that the fluid level is between the HOT/FULL and the COLD/FULL marks 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 Power Steering System Bleeding.

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.

2008 Chevrolet Silverado 1500

2008 STEERING Power Steering - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

POWER STEERING SYSTEM FLUSHING

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 .

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. With the key on engine off, turn the steering wheel fully to the left and to the right while an

assistant maintains the minimum fluid level in the reservoir using new approved power
steering fluid. Continue until the fluid from the return hose runs clear.

7. Remove the plug from the pump reservoir inlet connection and install the fluid return hose

to the pump reservoir.

8. Bleed the power steering system. Refer to Power Steering System Bleeding.

9. Inspect the power steering fluid for the following indications of contamination:

Milky fluid - water

Brown fluid - burnt

Plastic debris or dirt chunks

10. If the fluid is contaminated, repeat steps 2-9.

11. Lower the vehicle and check the Power Steering system for leaks.

POWER STEERING PUMP PULLEY REPLACEMENT (4.3L, 4.8L, 5.3L, 6.0L, 6.2L)

Tools Required

J 25033-C Pulley Installer. See Special Tools.

IMPORTANT: Do not reuse any drained power steering fluid regardless of

appearance or condition.

IMPORTANT: This step may require 4 L (4 qt) of power steering fluid until

the draining fluid appears clear.

IMPORTANT: Do NOT run the engine without the power steering fluid at a

minimum system level.

2008 Chevrolet Silverado 1500

2008 STEERING Power Steering - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

J 25034-C Pulley Remover. See Special Tools.

Removal Procedure

1. Remove the engine coolant fan upper shroud, if equipped. Refer to Engine Coolant Fan

Upper Shroud Replacement (Mechanical) or Engine Coolant Fan Upper Shroud
Replacement (Automatic Transmission - Diesel) .

2. Remove the accessory drive belt. Refer to one of the following:

For 4.3L engine, refer to Drive Belt Replacement .

For 4.8L, 5.3L, 6.0L, and 6.2L engines, refer to Drive Belt Replacement -
Accessory .

Fig. 8: View Of Power Steering Pump Pulley Remover

2008 Chevrolet Silverado 1500

2008 STEERING Power Steering - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado