Started my CT this morning in the cold from my remote start and heard a clanging sound like a small shovel banging around in a small metal bucket. In a couple of minutes it stopped. What the heck. Since then I the noise has not happened again. Don't know what to think could cause it and dont know if the dealer will be able to duplicate it. I have just about 20,000 miles and am not a happy camper. Help please!!!