Hello all. Started hearing a buzzing noise a couple days ago but it’s only for about 1 second on cold start. Only happens on cold start, If I turn the engine off and on again after about 5 seconds it doesn’t make the noise but coming back out to my car after work it’ll make the noise again. Sounds like you’re holding a piece of metal to a spinning plastic fan or a weed whacker or a heat shield . Sounds like it’s external and coming from somewhere around the bottom of the engine bay. Occasionally has the wobbly rattle sound as well on startup for the first 1-2 seconds but more concerned about the buzzing sound. Just wondering if anyone here knew what it could be? Cheers