Hi Y'all! Recently purchased a 2008 Double Cab and just noticed while sitting in truck for about a minute after shutting it off, a low kinda groaning noise coming from under driver's side (I think) dash. Everything's working ok, I can only imagine it might be vacuum-related(?). In perhaps a separate issue, have also noticed that the volume of air moving thru the vents while fan is on high leaves a lot to be desired........not very powerful at all. Is that a common issue with 2nd Gen Tundras? Thanks for any help!