Tools you'll likely need:
* Wrench set (metric): You'll need the correct size wrenches to loosen the tensioner pulley. Consult your owner's manual or a repair manual for the specific sizes.
* Socket set (metric): Might be needed depending on the access to the tensioner.
* Jack and jack stands: Essential for safe working conditions. Never work under a vehicle supported only by a jack.
* Wheel chocks: To secure the vehicle.
* New AC belt (correct size): Get the correct size belt from a parts store – matching the one you're replacing or the number specified in your owner's manual.
* Gloves: Protect your hands.
* Ratchet and extensions: To reach the tensioner pulley.
* Pliers (optional): Might be helpful for manipulating the belt.
Procedure (General Steps – Always consult your repair manual for specifics):
1. Safety First: Park your Silverado on a level surface, engage the parking brake, and use wheel chocks. Raise the front of the truck securely using a jack and support it with jack stands. Disconnect the negative battery terminal.
2. Locate the AC Belt and Tensioner: The AC belt is part of the serpentine belt system. Locate the tensioner pulley (it's usually a pulley with a spring mechanism). This pulley will need to be loosened to remove the belt.
3. Loosen the Tensioner Pulley: This is the crucial step and often the most challenging. You'll likely need to use a wrench or socket to turn a bolt on the tensioner. Turning this bolt will release the tension on the belt. Refer to your repair manual or a diagram for the specific location and direction of rotation to loosen the tensioner. Turning the wrong way can damage the tensioner.
4. Remove the AC Belt: Once the tension is released, carefully slip the AC belt off the pulleys. It may require some maneuvering and possibly using pliers to help.
5. Install the New Belt: Route the new belt onto the pulleys in the same path as the old belt. Ensure it's seated correctly on all pulleys.
6. Tighten the Tensioner Pulley: Once the new belt is in place, tighten the tensioner pulley bolt back to its original position.
7. Lower the Vehicle: Carefully lower the vehicle using the jack.
8. Check Belt Tension: After lowering the vehicle, visually inspect the belt to ensure it's properly seated and has the correct tension.
9. Reconnect Battery Terminal: Reconnect the negative battery terminal.
10. Test the AC: Start the engine and check if the AC system works correctly.
Important Considerations:
* Repair Manual: A repair manual specific to your 2004 Chevy Silverado is highly recommended. It will provide detailed diagrams, torque specifications, and specific instructions for your vehicle.
* Tensioner Pulley: Some Silverado models may have different tensioner pulley mechanisms (e.g., some might use a lever instead of a bolt). The repair manual will clarify this.
* Professional Help: If you are not comfortable with this task or unsure about any step, seek professional help from a qualified mechanic. Improperly tightening the tensioner can lead to belt failure and potential damage to other components.
This is a general guide; always prioritize safety and consult a repair manual for your specific vehicle model before attempting this repair. Remember, incorrect procedures can cause damage.
