My PP with 5100 miles and 7 months old just started making a muffled rattling/rumbling noise that seems to be coming from the engine compartment but sounds louder inside the cabin. The noise is constant and only changes in volume and not frequency. There is a black hose that comes from the AC compressor and connects to metal tubing and ultimately goes through the firewall close to the center. When I grab that hose I can feel a vibration that could translate to the noise I'm hearing inside the cabin. The dealer looked at it today but couldn't isolate the noise and due to time constraints asked that I bring it back. Has anyone had this issue?