Noisy something? AC related
 

Ok, so I ran over a curb at low speed and busted a left side radiator. Replaced the radiator. No apparent damage to the AC condenser and the AC works. Last PM I notice a grindy/growly/rattle sound coming from what sounded like beneath the passenger seat (too soon to be coincidental.) when I turned off the AC, immediately stopped. Would the compressor rattle if the refrigerant was getting low or just stop running at low pressure. Aux fan maybe?

Things to check?