The diagram for the replacing the serpentine belt has been removed from my used car. I need a diagram to show me how to replace the thread the belt around the pulley, AC, tension. Chevy Tahoe 1999.

there should be a decal under the hood somewhere that shows the belt routing. if its gone you can probably go to the library and find a book of your car that will show the routing and you can either draw a picture or take a photo of it.

The squealing sound you are hearing is the serpentine belt slipping. There are a couple of things this might be. Your serpentine belt may be stretched and no longer fits properly. If the belt is old and starting to dry out you will notice cracks and possibly pieces out of the channels on it. You should look to replace this if you haven't already. The belt itself may not be threaded through all the wheels properly and that is why it does not fit properly. Here is a link to see the serpentine belt diagram for your car. Simply choose the make, model, year and engine for your car to see how it should be properly installed.
http://www.2carpros.com/diagrams It may also be that the belt tension-er is no longer working properly. If you are not sure which wheel is the belt tensioner check the diagram from the link I provided above. Once you know which one the tensioner is, use a wrench or socket wrench to make sure that it still has motion and that there is no part where there is motion but no pressure. If this is the case the tensioner needs to be replaced. It is not difficult to replace, there are usually 2 or 3 bolts that hold it on, that need to be removed then bolt on the new tensioner. Hope this helps. Thanks for using FixYa.

A person doesn't need a diagram to replace a serpentine belt.

Simply thread the belt around the pulleys alternating between smooth pulley to back of the belt, and the grooved pulleys to the inside of the belt, until the last pulley is the tensioner pulley, which is loosened using a breaker bar.

It really is that simple.

Get the replacement belt, and then note the pulleys that have smooth finish, and note the pulleys that have the grooved finish.

Just 'thread' the serpentine belt, one pulley after another alternating between the smooth and grooved until the last remaining pulley is the tensioner pulley.

Use the breaker bar to allow the pulley to accept the belt, and you're done.

Click on the following free direct Link. It has several of the Serpentine Belt Diagrams and Tensioners that are possible with your 2.0L 4-Cylinder engine and engine options (AC/No AC, etc.).

http://www.2carpros.com/car_repair_information/year/1990/make/pontiac/model/sunbird/1990_pontiac_sunbird_drive_belt_routing_diagram.htm

A. Remove the Serpentine Belt.
"HOW TO":
Standard Rules to Removal the Serpentine Belt with a Tensioner:
1. Find the Tensioner(s). (See Diagrams on Link)
2. Using a Serpentine Belt Tensioner Tool, Or Wrench OR Ratchet, Rotate/Move the Tensioner USING THE AVAILABLE NUT (on the Pulley or Arm Base) OR the OPENING (3/8ths or 1/2 inch square opening) rotating the Tensioner Pulley/Arm - moving it away from contact with the belt and towards the area where the belt is not in contact with the Tensioner Pulley. The Tensioner is spring loaded, and is hard to rotate/move.
3. Remove the loosened belt off one of the other more easily accessed Pulleys.
4. DO NOT quickly release the Tensioner, but gently allow the Tensioner to rest in its closed position.

B. Remove the Tensioner:
Removing the Tensioner Pulley: See the Diagrams in the Link.
After the Belt has been removed, with the Tensioner resting:
DEPENDING ON WHAT TYPE TENSIONER:
(1.) IF the Tensioner Pulley itself HAS a Bolt Head showing, SOME of these bolts can be removed and the Tensioner Pulley replaced.
(2.) IF the Tensioner Pulley itself DOES NOT HAVE a Bolt Head showing, then go to the Tensioner Base located at the end of the Tensioner Arm. This should have a Bolt Head Showing. Remove this Bolt and the whole Tensioner Assembly will come off.
(3.) Some Tensioner Assembly's need you to locate and remove mounting bolts.

If Applicable: When replacing the Tensioner Assembly - MAKE SURE you place the protruding "nipple" on the underside base of the Tensioner into the appropriate cavity on the engine face.

Standard Rules for Installing the Serpentine Belt with Tensioners:
a. Pick a Pulley that is most easily accessed. This will usually be on top. This will be the last Pulley that the belt will go on.
b. Using the Diagram: Install the new Serpentine Belt on the remainder of the Pulleys....over, under, left right.
c. Using a Serpentine Belt Tensioner Tool or Wrench or Ratchet Tool: Rotate/Move the Tensioner Pulley/Arm "away" from Belt contact area on the Tensioner. This spring is pretty hard and with a new belt, it will be even harder to install. Rotate/Move this to as-close to the maximum allowed inorder to have enough slack in the belt to get it up and over the last pulley.
d. Using your other hand - Pull the Belt up and over the Last remaining Pulley.
e. Before releasing the pressure on the Tensioner, visually inspect the remainder Pulleys and the Belts' Positioning on them

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.Com!

diagram should be on the radiator shroud / top of radiator

this should be the correct routing for that belt


the tension looks like this


replacement is not too difficult. usually the bolt in the center turns opposite to how you normally loosen bolts. to remove the hole tension should be straightforward as you will see the bolts

First, keep this diagram around as you will need it to route the serpentine belt when you reinstall it. There may also be a diagram under the hood by the radiator.
Next, follow this link and watch the video that shows you how to replace a serpentine belt...
http://www.wonderhowto.com/how-to/video/how-to-inspect-and-replace-your-car-s-serpentine-belt-267229/

How do you bypass the serpentine belt from the a/c compressor the reg belt is 85in

The 96 Riviera has a motor mount that interferes with the removal and replacement of the serpentine belt. The motor mount must be loosened and the engine need to be lifted slightly to accomplish the replacement. Not good engineering on this model year.