Service Procedure

Inspection Procedure





1. Inspect and record the power steering pressure line for the date code as shown above. The date code is printed on the hose and is repeated approximately every 6 inches (150 mm). Depending on the vehicle configuration, there may be one or two hoses to inspect. Vehicles equipped with the hydro-boost system will have two hoses while others will only have one hose. Removal of conduit may be necessary in order to inspect the date code.





2. Rainier/TrailBlazer/TrailBlazer EXT/Envoy/Envoy XL with 4.2L Engine Power Steering Pressure Hose (1). This pressure line has two hose sections and both must be inspected. Vehicle may need to be lifted to inspect both.





3. Express/Savana Steering Pump to Hydro-Boost Pressure Line (2).





4. Express/Savana Hydro-Boost to Steering Gear Pressure Line (1).





5. Silverado/Tahoe/Sierra/Yukon/Escalade Non Hydro-Boost Pressure Line (3).





6. Silverado/Tahoe/Sierra/Yukon/Escalade Power Steering Pump to Hydro-Boost Pressure Line (1).





7. Silverado/Tahoe/Sierra/Yukon/Escalade Hydro-Boost to Steering Gear Pressure Line (1).





8. Hummer H2 Power Steering Pump to Hydro-Boost Pressure Line.





9. Hummer H2 Hydro-Boost to Steering Gear Pressure Line.





10. Corvette Power Steering Pressure Hose (2). The vehicle will need to be lifted on a hoist for inspection. Removal of the power steering cooler bolts will give increased access to the pressure hose.





11. Compare the date code on the hose(s) to the suspect date codes shown.

- If the date code is one of the codes listed, the hose(s) must be replaced. Proceed to the Hose Replacement Procedure.

- If the date code is not one of the codes shown, then replace the conduit if applicable and no further action is required.

Hose Replacement Procedure








If the inspection reveals that the hose needs to be replaced, follow the instructions in SI. Shown are the SI document numbers.