Quote Originally Posted by tdgard
Change your microfilter for the weak airflow. As for the grinding/throbing sound, wait it out. It may be that when you change the filter it goes away, but if it does not a new motor may be in your future. This should be a long time in the future. Mine made racket for years before finally giving up. Quite a simple process and only about 200 bucks.
ONLY $200? I pretty sure i dont have a microfilter.