Loud rattling noise coming from engine compartment when AC is turned on

I could really use some help with this when I'm stumped. About 3 weeks ago I've noticed when I turn the AC on there's a loud rattling noise coming from the front end. I jumped the gun and immediately assumed it was the compressor. I've replaced the compressor and the condenser. I've recharged the system and the AC was working great. The problem is the noise is still there. There is no trouble codes. Car runs great otherwise. As soon as AC button is pushed the compressor comes on and I have AC but I have a very loud rattling sound near the right front of the engine compartment? Any help would be greatly appreciated.

 

Car motor is running good. As soon as I press the AC button I get a severe rattling noise. If I stand in front of the engine the noise appears to be coming from just right of the air cleaner box. There is nothing loose or rattling that can be seen. When I step on the gas and give it a little gas the noise does not go away. I just don't understand why this happens when I turn the AC on? I have replaced the AC in the condenser because I thought the AC compressor was bad but it was not. Evacuated the system after the parts were changed and recharged per OEM instructions AC works great but bad rattling is still there? Help! I am not a Toyota technician. I have worked for general motors for many years years ago but I'm not familiar with these systems on these hybrids that well

 

Thank you everybody for your help. Just turned out to be a rather simple problem. Every time I turn the AC on I would hear what to me sounded like bearings that went bad like a rattle. This time I shut the AC off and when the fan came on with the AC off for cooling the noise came back. Using a stethoscope a trouble shot it to being the bearings in the fan. I did not even consider this since I replaced that fan about a year ago. Thanks for your help everybody