No it could be air condition clutch that engage/disengage the air condition compressor and disengage it through the pulley or could be the pulley bearings one of them . also check the solenoid that controls that clutch .
have a good luck sir .
Check for loose exhaust heat shields. If they get bent a little, they can rattle. With the AC on and in gear, the engine has more load and more vibration. A loose shield would rattle. Start with the cheap and easy stuff first. May have to have someone hold it in gear with AC on while you listen for source of rattle.
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the air stopped working and now there is a rattling noise
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