If there are no odd sounds and you have no assist, chances are the pump is bad. Since the fluid is still full, it sounds like it isn't producing pressure. This video shows the job being done on a similar car but the process is the same.
https://youtu.be/EXDysSOs07g
Regardless, if you look at the first three attachments below, I included the flow charts for diagnosing power steering pump issues.
Also, here is a link that discusses possible causes:
https://www.2carpros.com/articles/power-steering-problems
I am adding two more links here. The first link is in the event you replace the pump and have to reuse your old pulley. The second shows in general how the procedure is done. You can use it as a guide.
https://www.2carpros.com/articles/remove-reinstall-power-steering-pulley
https://www.2carpros.com/articles/how-to-replace-a-power-steering-pump
If you look at the additional attachments, they are directions specific to your vehicle for the pump replacement.
I hope this helps. Let me know if you have other questions.
Take care,
Joe
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Saturday, March 27th, 2021 AT 7:47 PM