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There was a dual overhead cam so I'm guessing that's the engine you are talking about The other 3.0 liter engine wasn't an overhead cam engine. I went on to be on the safe side and provided belt diagrams for both engines because they were different. The first picture and description of which pulley is which is for the DOHC 3.0L engine which is what I'm guessing you have. The second set of pictures/descriptions is for the other 3.0L engine. Hope this helps....
Pop the hood of the car and locate the serpentine belt routing diagram. The diagram on the 2003 Chevrolet
Impala is on top of the fan shroud. The diagram will be a picture of
all of the accessory pulleys and how the serpentine belt is routed among
the pulleys. This diagram will give you the exact direction for routing
the new belt onto the pulleys. If you cannot find a serpentine belt
routing diagram, take a notepad and pen and draw out the exact routing
diagram of the old belt across the pulleys.
2
Locate the serpentine belt tensioner. It is located below the alternator
on the left front side of the engine. The tensioner on the 3.4 liter,
3.5 liter and the 3.9 liter engines will require a 3/8 ratchet to
release the belt tensioner. The 3.8 liter engine will require a ratchet
and a 15 mm socket for the belt tensioner. Rotate the belt tensioner
clockwise to loosen and remove the belt from the belt tensioner pulley.
3
Slide the old belt from the belt
tensioner pulley. Remove the belt from the remaining pulleys and pull
the belt from the engine compartment.
4
Route the new belt across the
crankshaft pulley first. The crankshaft pulley is the big pulley on the
bottom of the engine in the center. Then route the serpentine belt
across the remaining pulleys as directed by the serpentine belt routing
diagram. Leave the belt tensioner pulley for last.
5
Rotate the belt tensioner
clockwise again to relieve the tension and slide the new belt across the
top of the belt tensioner pulley. Release the belt tensioner and the
belt will tighten up as the tensioner applies pressure to the belt. Make
sure the new belt is properly seated in all the pulleys.
6
Crank the engine and inspect the belt again to make sure that it stays seated in the pulleys.
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