Q: A.c. is knocking when turned on but I am not having any a.c. problems just the noise. Replaced it and nothing has changed

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A.c. is knocking when turned on but I am not having any a.c. problems just the noise. I changed out the actuator in the glove compartment but am.still having the same issue

My car has 156000 miles.
My car has an automatic transmission.

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