Serpentine belt replacement instructions and diagram for a 2004 grand prix

Under the hood there will be a routing diagram for the serpentine belt. Use that as a guide for replacement routing. There is an automatic belt tensioner in the loop. Use an appropriate tool to release the tension on the old belt and remove it from the vehicle. Route the new belt as per the diagram and allow the automatic tensioner to re-tension the belt.

usually somewhere under the hood you will find a diagram showing how your belt should go. If not ask your local discount auto parts store and they can help you.

If it is a rattling sound the starter may be loose, the starter bendix gear might be damaged.

If it sounds like a fan, it is likely the cooling fan.

If it is squealing, it is the serpentine belt. The idlers may be worn, their bearings may be dry- they make a chirping sound at slower speeds when they are dried out. Replacement is the best option.

Air pumps can sometimes make a thumping sound, and if certain emissions valving rusts through, it can be outright exhaust noise.

If it is a high pitch whine, that is usually the alternator. It is not a good sign when they begin to whine. Alternator bearings can also fail, and the sound varies.

Water pumps and fan clutches can also fail and they tend to make softer sounds. These can be checked by checking for radial play in each item with and without serpentine belt tension applied.

Remove the serpentine belt and pull on the power steering pump pulley (pull out towards the radiator). If the pulley pulls out of the pump than the shaft is broken. This is very common on GM vehicles.

The pump is very easy to replace and I can give you some further instructions if needed.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

The diagram should be there under the hood, look for a white sticker up on the hood or down along the fan shroud.

The label that has the diagram is located either under the hood with the engine emissions info sticker, or on the front crossmember of the engine bay. If the sticker is missing, this page has all the diagrams to every serpentine belt they sell. The link to the diagram will be on the left; look for it because it doesn't appear as a link.

Hope this helps,
matt

Here's the diagram you requested. Best of luck!
Greg

That is the power steering belt routed around pump pulley that is slipping . The power steering is located behind the steering column, replacing and re-routing the belt is not an easy repair.

If instead the whining noise comes from under the hood , that is the serpentine belt, that is easier to repair.

first look underneath the hood... is it there on a sticker... if not i'll need the size of the motor to let you know

Robert

The belt installation diagram is under the hood, look on the shock tower or over the radiator next to the Federal emissions certification sticker.