Sierra 1500 2WD V6-4.3L (2008)
Steering Rack Gear: All Technical Service Bulletins
Steering/Suspension - Power Steering Fluid Leaking
ENGINEERING INFORMATION
Bulletin No.: 07-02-32-002J
Date: July 23, 2010
Subject: EI07082 - Power Steering Fluid Leaking from Power Steering Gear/Rack Assembly (Engineering Recommendations / Engineering Information
Closed)
Models:
2008-2011 Cadillac Escalade, Escalade ESV, Escalade EXT
2008-2011 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2008-2011 GMC Denali, Sierra, Yukon, Yukon XL, Yukon Denali, Yukon Denali XL
1500 Series Only and Excluding Hybrids
Supercede:
This bulletin is being revised to add the 2011 model year. Please discard Corporate Bulletin Number 07-02-32-002I (Section 02 - Steering).
Condition
Some customers may comment on a fluid leak. Upon investigation, the technician may find fluid leaking from the power steering system. Please use the
following information to assist in diagnosis.
Diagnostic Information
Important
All potential leaks should be completely cleaned and identified before attempting to repair or replace any power steering components.
1. Start diagnosis by inspecting the fluid level in the power steering reservoir. If the fluid level is NOT low, a careful analysis of the condition is
necessary as it may involve a different type of fluid leak.
2. Visually inspect the components where the fluid has accumulated.
3. Completely clean off any fluid residue from the suspect components.
4. Apply tracing powder to the suspect components. This is an effective way to determine the source of a leak. As an alternative, fluorescent dye
(such as Kent Moore J 28431-6) may be added to the power steering fluid.
5. Start the vehicle and allow the power steering system to reach normal operating temperatures.
6. Turn the steering wheel to the stops in each direction while bumping the steering wheel against the stops 3-4 times. This will build maximum
steering system pressure and help identify the source of the leak if present.
7. Determine the source of the leak.
8. If a repeatable leak is found, refer to the following tables to determine the proper corrective action needed.
Repairable Leaks
Non- Repairable Leaks
*If fluid is observed at the adjuster plug during the initial visual inspection, then refer to the following:
-
Seepage at the adjuster plug may not necessarily indicate an active leak. Power steering fluid is used during the manufacturing of the gear/rack.
The fluid used at assembly is pushed into the pinion area during assembly. The adjuster plug and the area below the pinion are not positively
