Today, I pulled my battery to have it tested and found the following fluid line laying disconnected in the battery tray. At first, I thought it was for washer fluid, but that connects on the driver's (left) side of the car. I traced this back as far as I could, and it appears to be coming into the frunk near the cabin air filter. Does anyone have any idea what it is for, and where it should be connected? I couldn't find any obvious connection points for this. This is on an '02 Boxster S.
Thanks for your help!