This is behind the passenger front strut, if anyone is wondering. I've always wondered what's supposed to be there. I tried to have the ac system recharged on the car and the tech said as soon as he hooked the machine up, he could hear air flow out, and he said there was a leak in a line somewhere. Someone else told me this is where the ac canister should be. I'm wondering if that's the case here. Can anyone help me out?