If the smell is like burning or heated rubber, then it could mean the belt is rubbing against one of the pulleys that it's supposed to be powering. That probably means that particular item isn't getting powered. For example, if your alternator seizes up, your battery won't charge, and the fact that it's stuck could cause the belt to heat up near it, causing the bad smell. If that's the case, then the belt may be wearing slick, in which case it'll need to be replaced as well.
Check your Serpentine Belt and pulleys. The Serpentine Belt maybe in need of replacement.
Check to make sure that the serpentine belt is ok, and that the ac clutch is working properly. Make sure that the serpentine belt has the proper tension.
Possibly the wrong belt was installed or most likely your belt tensioner is bad.
No, an accessory belt is not considered a serpentine belt. However, a serpentine belt is considered a specific type of accessory belt.
no. no relation at all
A serpentine belt has an idler pulley on is to keep it tight at all times. If your serpentine belt is loose, then something is worn out. Its possible the idler pulley is stuck in its bracket so it cannot move or the spring on it is worn out.
A squeaky belt is usually caused by a bad belt, a missaligned pulley, or something leaking on the belt.
The serpentine belt would be the same as the accessory drive belt.
its most likely your belt. its loose and when you start up your car it burns on the pullies. the only way to fix that would be to put a new belt it just got old. but that's the smell your smelling.
Serpentine Belt Diagram ML320
Serpentine belt, no. Timing belt, good chance yes.
There is no adjustment on the spring / Tensioner. You either have the wrong belt are the tensioner itself is bad. Replace tensioner are belt.