To properly bleed the power steering system on your Duramax, you'll need to first ensure the front wheels are off the ground, and the reservoir is filled to the correct level. Then, with the engine off, turn the steering wheel from lock to lock multiple times to purge air. Finally, start the engine and repeat the lock-to-lock steering wheel turns, checking and adjusting the fluid level as needed
Here's a more detailed breakdown
Preparation
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Fill the reservoir: Locate the power steering fluid reservoir and fill it to the "cold" or "full" mark with the recommended fluid.
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Lift the Truck: Raise the front end of your Duramax so the front wheels are off the ground, using jack stands for safety.
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Wheel Rotation: Turn the Steering Wheel lock to lock 10-25 times to purge any air.
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Prepare for activating the brake pedal: Your Duramax has a hydroboost system, charge the accumulator by pressing the brake pedal firmly 10-15 times with the engine off.
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Have a helper available: An assistant can help monitor the fluid level and ensure connections are secure.
Bleeding the system (engine off)
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Rotate the steering wheel: With the engine off, rotate the steering wheel from lock to lock (right and then left).
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Repeat the process: Do this multiple times, checking the fluid level in the reservoir periodically.
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Observe fluid: As you rotate the wheel, air will be released from the system. Bubbles may appear in the fluid. The fluid level may decrease as air is expelled.
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Refill as needed: Add more fluid to the reservoir as needed to maintain the correct level.
Final steps
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Check fluid level: After bleeding, ensure the fluid level is correct and the system is functioning properly.
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Clean up any spills: Clean up any spilled fluid to prevent damage to painted surfaces.
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Test drive: Take the vehicle for a test drive and ensure the steering feels normal and responsive.
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Recheck connections: If you suspect a leak, recheck all connections and tighten as needed.
Conclusion:
The Power Steering Bleed Procedure is straightforward yet important. Begin by filling the fluid to the cold level mark. With the truck on the ground, pump the brakes 5 to 10 times, then raise the front end. With the engine off, turn the steering wheel fully from lock to lock 10 to 15 times. Lower the truck, start the engine for about 5 seconds, then turn it off. Finally, check the fluid level and add more if needed.
