* Manually adjustable tensioner: This type uses a lever or bolt that you physically turn to loosen the tension. You'll usually find a bolt head or a lever arm that you can access with a wrench or a ratchet. Look closely around the tensioner pulley; you should see something that can be rotated.
* Spring-loaded hydraulic tensioner: This is more common on modern vehicles. This type uses a hydraulic mechanism controlled by a spring. Usually, you'll need a special tool to compress the tensioner, or you may be able to use a long pry bar, or a large screwdriver, very carefully. However, using a pry bar or screwdriver is risky and can damage the tensioner or other components. A specific tensioner tool is strongly recommended.
Before you start:
1. Consult your repair manual: This is the most important step. A repair manual specific to your 2000 GMC Sierra will show you exactly where the tensioner is, what type it is, and the correct procedure for releasing it.
2. Safety First: Disconnect the negative battery terminal to prevent electrical shorts. Support the vehicle securely on jack stands. Wear safety glasses.
3. Identify the tensioner: Locate the tensioner pulley. It's usually a component with a pulley connected to a spring-loaded mechanism or lever arm.
General Steps (Adapt to your specific tensioner type):
1. Locate the tensioner release mechanism: This could be a bolt, a lever, or a point of contact for a tensioner tool.
2. Release the tension: If it's a bolt, loosen it carefully using the appropriate wrench or socket. If it's a lever, carefully move it in the direction that reduces belt tension. If it's a spring-loaded hydraulic tensioner, use the appropriate tool or, with extreme caution, a pry bar or screwdriver *on the appropriate part of the tensioner* (refer to a repair manual or video for your specific vehicle). Do not force anything.
3. Remove the belt: Once the tension is released, the belt should be easy to remove from the pulleys.
Important Considerations:
* Type of tensioner: The method varies significantly based on the type of tensioner. This is why a repair manual is so important.
* Proper tools: Using the wrong tools can damage the tensioner or surrounding components.
* Careful approach: Avoid sudden movements or excessive force.
* Belt routing: Make a note of how the belt is routed before removing it. This is crucial for reinstallation.
If you're unsure about any step, it's best to consult a qualified mechanic. Incorrectly releasing or reinstalling the belt tensioner can lead to serious damage to your engine. Improperly tightening the belt can cause premature belt wear, bearing failure, or other problems.
