Hi and thanks for using 2CarPros.com.
If it is only happening when the AC is turned on, chances are the compressor is bad or going bad. Using an automotive stethoscope, listen the AC compressor to determine if that is where the sound is coming from. Be careful because the engine will be running, the belt turning, and the compressor engaging.
If you do not feel that is the problem, check through this link and see if there is anything that helps. If there is not let me know and we'll continue checking.
https://www.2carpros.com/articles/engine-noises
Take care,
Joe
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Wednesday, August 22nd, 2018 AT 6:15 PM