2005 S40 41k. Picked a belt noise can figure out A/C or Alternator. Video would upload/ Only Happens when car is warmed up and doesn't matter if A/C is on. any advise to pinpoint the issue?

 

My experience is most belt noises are from the idler wheel/tensioner parts versus the components. You can see if the noise changes when you engage/disengage the AC, or when you put a load on the alternator (ie turn on lights/blower/rear defroster/seat heater etc). The next step would be to use a mechanics stethescope to see if you can listen to a specific pulley or area. Finally you would need to pull off the belt, inspect it and manually turn the idler wheels/tensioner wheel to see if something feels like its dragging or has play in it.

 

Thanks, Looks like I'll be getting a new alternator!

 

when you go to install the alternator, you should consider checking and replacing the tensioner and idlers as well...

 

Sure it's not the PCV?

 

He has to pull the dipstick if that's the case. Think with your dipstick haleyvolvo lol