I purchased a demo 2018 Santa Fe sport in August with only 2200km. When I test drove the vehicle there were no noises coming from the vehicle, but now, on cold starts, the vehicle makes a very loud vibrating/rattling noise coming from the engine compartment that eventually does ease off as the vehicle warms. However its very unsettling as its quite loud. I did have the vehicle undercoated before I picked it up from the dealership but both the dealership I purchased it from(Ford) and the Hyundai dealership say they cant find anything. I just took a video of the noise and quite frankly I hear the rattling. But apparently its all in my imagination. Anyone else have this issue with the rattling noise?