CTS 2003-2005

Accessory Drive Belts

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Adjustment



Belt tension is automatically adjusted by the belt tensioner.

Belt tension is maintained by the automatic tensioner and is not adjustable.

Belt Tension Inspection



Inspect the drive belt for signs of glazing or cracking. A glazed belt will be perfectly smooth from slippage, while a good belt will have a slight texture of fabric visible. Cracks will usually start at the inner edge of the belt and run outward. All worn or damaged drive belts should be replaced immediately.

Inspect the belts for signs of glazing or cracking. A glazed belt will be perfectly smooth from slippage, while a good belt will have a slight texture of fabric visible. Cracks will usually start at the inner edge of the belt and run outward. All worn or damaged drive belts should be replaced immediately. It is best to replace all drive belts at one time, as a preventive maintenance measure, during this service operation.



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Fig. There are typically 3 types of accessory drive belts found on vehicles today.



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Fig. Installing the incorrect belt, or failing to install the belt properly will give this result



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Fig. The belt routing for your vehicle should be found on an underhood label



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Fig. This high-mileage Lumina's accessory drive belt is showing signs of distress but is still serviceable

Drive Belt Routings





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Fig. Serpentine drive belt routing-3.2L engine



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Fig.



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Fig.



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Fig.



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Fig.



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Fig.



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Fig. Serpentine drive belt routing-GM 3.1L engine



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Fig. Serpentine drive belt routing-GM 3.4L (VIN E) engine



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Fig. Serpentine drive belt routing-GM 3.8L (VIN 1) engine



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Fig. Serpentine drive belt routing-GM Bodies 3.8L (VIN K) engine

Removal & Installation




WARNING
Before removing or disconnecting the battery on these vehicles, record all of the vehicle preset radio stations (if applicable). Record the radio's THEFTLOCK® code (If applicable). Turn all lamps and accessories OFF. Always disconnect the negative battery cable first, and reconnect last.

2.8L & 3.6L Engines
  1. Using a ½ drive breaker bar or ratchet, rotate the drive belt tensioner clockwise in order to release tension on the drive belt.
  2.  
  3. Remove the drive belt from the generator pulley.
  4.  
  5. Slowly release the drive belt tensioner.
  6.  
  7. Remove the drive belt from the water pump pulley and crankshaft balancer.
  8.  
  9. Using a ½ drive breaker bar or ratchet, rotate the drive belt tensioner clockwise in order to release tension on the drive belt.
  10.  
  11. Remove the drive belt from the power steering pump pulley.
  12.  
  13. Slowly release the drive belt tensioner.
  14.  
  15. Remove the drive belt from the air conditioning (A/C) compressor pulley, idler pulley, and crankshaft balancer.
  16.  

To install:

  1. Install the drive belt around the crankshaft balancer, idler pulley, and A/C compressor pulley.
  2.  
  3. Using a ½ drive breaker bar or ratchet, rotate the drive belt tensioner clockwise.
  4.  
  5. Install the drive belt to the power steering pump pulley.
  6.  
  7. Slowly release the drive belt tensioner.
  8.  
  9. Install the drive belt onto the crankshaft balancer and water pump pulley.
  10.  
  11. Using a ½ drive breaker bar or ratchet, rotate the drive belt tensioner clockwise.
  12.  
  13. Install the drive belt to the generator.
  14.  
  15. Slowly release the drive belt tensioner.
  16.  
  17. Ensure the drive belt is properly aligned and seated into the grooves of the accessory drive pulleys.
  18.  

3.1L (VIN M) And 3.4L (VIN E) Engines


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Fig. Remove the drive belt by rotating the tensioner off the belt using a 3/8 in. breaker bar or ratchet



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Fig. This label shows the accessory belt routing on a Lumina with a 3.1L engine

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the drive belt shield.
  4.  
  5. Fit a 3 / 8 inch breaker bar or ratchet to the square hole in the tensioner. Lift, or rotate the tensioner off of the drive belt. When the tension on the belt is removed, slide the drive belt from the pulleys.
  6.  

To install:

  1. Taking care to follow the proper routing of the belt, slip the belt onto the pulleys. As a help, note that the water pump pulley is usually driven from the back (smooth side) of the belt.
  2.  
  3. Fit a 3 / 8 -inch breaker bar or ratchet to the square hole in the tensioner. Lift, or rotate the tensioner and, with the belt in place, gently release the tensioner.
  4.  
  5. Verify that the belt is correctly routed and aligned in the proper grooves of the accessory drive belt pulleys. Inspect the drive belt length scale on the drive belt tensioner for the proper indicated length. If the drive belt length scale does not indicate the proper installed length, the belt may be incorrect, incorrectly installed, worn out or the tensioner may be defective.
  6.  
  7. Connect the negative battery cable. Start the vehicle and verify correct operation.
  8.  

3.2L Engines
  1. Rotate the drive belt tensioner clockwise to release drive belt tension.
  2.  
  3. Slide the drive belt from the water pump pulley.
  4.  
  5. Allow the drive belt tensioner to return to the relaxed position.
  6.  
  7. Remove the drive belt from the accessory drive pulleys.
  8.  

To install:

  1. Route the drive belt to the accessory drive pulleys, excluding the water pump pulley.
  2.  
  3. Rotate the drive belt tensioner clockwise.
  4.  
  5. Route the drive belt over the top of the water pump.
  6.  
  7. Ensure the drive belt is properly aligned and seated into the grooves of the accessory drive pulleys.
  8.  
  9. Release the drive belt tensioner and inspect the drive belt for proper seating in the accessory drive pulleys.
  10.  

3.4L (VIN E) Engine


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Fig. Accessory drive belt routing-3.4L (VIN E) engine

  1. Disconnect the negative battery cable.
  2.  
  3. Rotate the drive belt tensioner in order to release the pressure on the drive belt.
  4.  
  5. Remove the drive belt from the vehicle.
  6.  

To install:

  1. Taking care to follow the proper routing of the accessory drive belt, slip the belt onto the pulleys, except the alternator pulley.
  2.  
  3. Rotate the drive belt tensioner to install the drive belt over the alternator pulley last.
  4.  
  5. Make sure the belt is correctly routed.
  6.  
  7. Verify that the mark on the drive belt tensioner is in range, as indicated on the tensioner housing.
  8.  

3.4L (VIN X) Engine


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Fig. Rotate the drive belt tensioner clockwise with a box-end wrench-3.4L (VIN X)

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the coolant recovery reservoir.
  4.  
  5. Using a box-end wrench of the appropriate size, rotate the drive belt tensioner clockwise to remove the tension on the drivebelt.
  6.  
  7. Remove the drive belt
  8.  

To install:

  1. Taking care to follow the proper routing of the belt, slip the belt onto the pulleys.
  2.  
  3. Using the same box-end wrench, rotate the tensioner and slip the belt over the tensioner pulley. Slip the belt over the power steering pulley last.
  4.  
  5. Install the coolant recovery reservoir.
  6.  
  7. Connect the negative battery cable. Start the vehicle and verify correct operation.
  8.  

3.5L (VIN H) Engine


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Fig. Accessory drive belt routing-3.5L (VIN H) engine

  1. Disconnect the negative battery cable.
  2.  
  3. Rotate the drive belt tensioner in order to release the pressure on the drive belt. Note that there are two square holes in the tensioner bracket, accepting either a 3 / 8 or 1 / 2 inch breaker bar.
  4.  
  5. Remove the drive belt from the vehicle.
  6.  

To install:

  1. Rotate the drive belt tensioner, and, taking care to follow the proper routing of the accessory drive belt, slip the belt onto the pulleys.
  2.  
  3. Inspect the drive belt and pulleys to verify proper alignment.
  4.  

3.8L (VIN 1) Engine

The supercharged 3.8L (VIN 1) engine uses two drive belts. The outer belt drives the supercharger. The inner belt drives the alternator, power steering pump, coolant pump and air conditioning compressor. Each belt has its own tensioner.



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Fig. The 3.8L (VIN 1) supercharged engine uses two drive belts. The outer drive the supercharger, the inner drives most accessories



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Fig. Supercharger belt routing-3.8L (VIN 1) engine



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Fig. Accessory drive belt routing-3.8L (VIN 1) engine

  1. Disconnect the negative battery cable.
  2.  
  3. Using a 15mm box-end wrench on the supercharger drive belt tensioner pulley nut, lift, or rotate the drive belt tensioner to take the pressure off of the belt. Remove the supercharger drive belt.
  4.  
  5. Using a 15mm box-end wrench on the accessory drive belt tensioner pulley nut, lift, or rotate the drive belt tensioner to take the pressure off of the belt. Remove the accessory drive belt.
  6.  

To install:

  1. Taking care to follow the proper routing of the accessory drive belt, slip the belt onto the pulleys.
  2.  
  3. Using the same 15mm box-end wrench, rotate the accessory drive belt tensioner and slip the belt over the tensioner pulley.
  4.  
  5. Using the 15mm box-end wrench again, rotate the supercharger drive belt tensioner and slip the supercharger belt over the tensioner pulley.
  6.  
  7. Connect the negative battery cable. Start the vehicle and verify correct operation.
  8.  

3.8L (VIN K) Engine
  1. Disconnect the negative battery cable.
  2.  


NOTE
The drive belt path on the 3.8L (VIN K) engine is somewhat complicated. An underhood sticker should show the correct routing. If the label is missing or unreadable, make a sketch of the belt's path. A minute spent now can save much time later.

  1. Using a 15mm box-end wrench on the pulley nut, lift, or rotate the drive belt tensioner to take the pressure off of the belt. Remove the drive belt.
  2.  



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Fig. This label shows the accessory belt routing on a Grand Prix with a 3.8L engine



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Fig. Rotate the tensioner off the drive belt using a 15mm box-end wrench on the pulley nut-3.8L (VIN K) engine

To install:

  1. Taking care to follow the proper routing of the belt, slip the belt onto the pulleys.
  2.  
  3. Using the same box-end wrench, rotate the tensioner and slip the belt over the tensioner pulley. Slip the belt over the power steering pulley last.
  4.  
  5. Connect the negative battery cable. Start the vehicle and verify correct operation.
  6.  

5.7L Engine
  1. Remove the air outlet duct.
  2.  
  3. Install a breaker bar with hex-head socket to the drive belt tensioner bolt.
  4.  
  5. Rotate the drive belt tensioner clockwise in order to relieve tension on the accessory drive belt.
  6.  
  7. Remove the accessory drive belt from the pulleys and tensioner.
  8.  
  9. Slowly release tension on the drive belt tensioner.
  10.  
  11. Remove the breaker bar and socket from the drive belt tensioner bolt.
  12.  
  13. Clean and inspect the drive belt surfaces of all the pulleys.
  14.  

To install:

  1. Route the accessory drive belt around all the pulleys except the water pump pulley and tensioner.
  2.  
  3. Install a breaker bar with hex-head socket to the drive belt tensioner bolt.
  4.  
  5. Rotate the drive belt tensioner clockwise in order to relieve tension on the drive belt tensioner.
  6.  
  7. Install the accessory drive belt under the water pump pulley.
  8.  
  9. Install the accessory drive belt onto the drive belt tensioner.
  10.  
  11. Slowly release the tension.
  12.  
  13. Remove the breaker bar and socket from the drive belt tensioner bolt.
  14.  
  15. Install the air outlet duct.
  16.  
  17. Inspect the accessory drive belt for correct alignment.
  18.  

 
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