xCharmCity

I have a W205 C43 and when my engine is cold my car makes a noise when I accelerate and brake. It sounds like a fan is spinning and rubbing against something. Almost sounds like when something is stuck in the spokes of a bicycle tire. It only happens when cold and it doesn't seem linked to engine RPM since the sound happens after I've started to accelerate and brake and gets louder even if I don't build revs. Any ideas? Thanks so much!