for the grinding noise...problem no 3.
the sound is made when starting the car, it does not occur frequently but very disturbing when occured. to be specific, it makes the sound right after the key is turned to start from on.
i'm not sure if it comes from the air vent.. but it's from the left side of the steering wheel. A/C system is at the off position.
and also i don't think it's the ABS self check. thanks anyway!