Thanks for the link. I guess I could pull the blower motor out and scope it out to see anything that looks out of place. I'll post back when I get around to doing that...which hopefully will be this weekend. Please let me know what you find.

Heat, AC, or just fan, when the air is running there is a low grumbling noise. This noise gets louder the harder it blows. Is it a hose or the blower motor...or? I'm not sure, and figured I would check if anyone has had this problem, or knows what's causing the noise, before I tear into it, or take ...