Q: Q: AC not working

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Hi. I took my car to the dealer to have an oil change. My AC was working fine and gave cold air. After picking up my car, the speed (amount) of cold air the AC is giving is the same amount when I have it at a low speed as in in high speed. It doesn't matter what speed I have the knob it continues to give out the same speed with is low. Is it possible that the mechanic that changed the oil turned anything low to affect the AC?

My car has 120000 miles.
My car has an automatic transmission.

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