Hear funny rattling noise by tension spring pulley, replaced pulley but there is still noise. could it be my bearings in ac compressor making noise? do the clutch suppose to move by hand?

The ac compressor runs in defrost mode.
So the noise could be a belt tensioner or something involving the ac compressor pulley.

the clutch and bearing assembly is failing it is a freewheeling pulley till clutch is engaged but it has bearings which can fail

big end bearings( lower engine rod bearings to confuse) knock at idle and get louder with rpm
if the noise changes with rpm and you are hearing it near the ac compressor then it could be the ac pulley bearing
test if it is the compressor by listening and then turning the ac off the pulley will still spin but the compressor stops
if the noise remains , replace the pulley bearings

once the belt become loose it slips and its friction surfaces become damaged .. even if its then tightened properly it may still slip .. an old damaged belt should be replaced and tensioned properly ... its common for older type belts to slip and make noise .. it is not as common in later cars since they often have automatic belt tension and improved belts .. any slipping is a sign of some other problem ... one frequently seen problem on some cars is a pulley that is spring loaded to keep the belt properly tightened .. the pivot on the pulley freezes up and no longer maintains proper tension .. those pulleys can sometimes be re lubed but often are hopelessly frozen and need replaced ... also other pulleys and the alternator bearings can start to make a squeaking noise when the sealed bearings lose there lube .. you can put a drop of oil on each bearing to see if one quiets the sound ..

this could be a bad pulley or alternator, you will need to remove the belt and spin the pulleys by hand to see which one is making noise, it could also be the ac compressor pulley, start there.

I had the same issue with my 2006. I thought the compressor clutch bearings were faulty. After further research, the rattling noise was actually coming from the serpentine belt tensioner. Easy repair!
Hope this helps.

there are a few things you can do to check this ,it sounds like a bearing from the alternator . it is behind the pully ,or the bearing on the tensioner .you can take the serpentine belt of the alternator by usint a pry bar or a ratchet on the belt tensioner .you can check both by spinning them when ther is no pressure on them the one that makes the same noise sound is the bad one ,there is a diagram on the front hood on how to remove and replace the serpiene belt

Sounds like the AC compressor is going bad. Have the compressor tested and I'm sure the belt is what you were smelling. make sure nothing is touching the AC belt. If the compressor stops working properly the belt will burn. Solution= replace compressor and belt.

check idler /tensioner pulley bearings and also check each component alternator, blower, power steering!!

replace it it has a pre tensioned spring and if it makes noise its junk. replaced the idler pulley at the same time