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Some owners have, indeed noted power-steering problems in this model Commodore. That said, this is a very common model, so some problems are to be expected as they with most other makes and models.
The most common problem seems to be a squealing noise when the wheel is turned. That’s often due to low power-steering fluid level (check the dipstick at the top of the reservoir under the bonnet). If the level is low, you need to start looking for a leak as this is a sealed system and shouldn’t need topping up over time. Leaks can occur in the pump itself, the steering rack or the plumbing that joins them.
A vibration through the wheel or a fluttering sensation can often be caused by air trapped in the system. With the engine running and the car in Park, turn the wheel slowly from lock to lock a couple of times., That’s often enough to purge the air and return the steering to a nice smooth feel.
Some owners have reported an improvement in their power-steering by draining and flushing the system and adding new fluid.
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