Tools You'll Need:
* Wrench(es): The appropriate size(s) to loosen and tighten the tensioner pulley. This will likely be a 13mm or 15mm wrench, but check your manual. You may need a ratchet and extensions for better access.
* Socket wrench and sockets: Possibly needed depending on how the tensioner is accessed
* New AC belt: Ensure you get the correct size belt. Check your owner's manual or a parts store using your VIN.
* Gloves: To protect your hands.
* Jack and jack stands (optional but recommended): For easier access and safety.
* Safety Glasses: Protect your eyes from potential debris.
Steps:
1. Safety First: Engage the parking brake firmly. If you're using a jack, properly secure the vehicle on jack stands. Never work under a vehicle supported only by a jack.
2. Locate the AC Belt: The AC belt is usually one of the shorter belts on the engine. It will run from the crankshaft pulley to the AC compressor pulley and possibly other pulleys.
3. Locate the Belt Tensioner: This is a pulley that allows you to release tension on the belt so you can remove it. It will likely have a pivoting mechanism. Your owner's manual will show you where it's located.
4. Release Belt Tension: Using the appropriate wrench, carefully turn the tensioner pulley to relieve the pressure on the belt. You'll need to apply some force; it might be stiff. *Be careful; the tensioner might spring back suddenly.* Some tensioners require a socket to turn them, others a wrench.
5. Remove the AC Belt: Once the tension is released, carefully slip the belt off the pulleys.
6. Install the New Belt: Carefully route the new belt onto the pulleys in the same path as the old belt. Make sure it's seated correctly on each pulley.
7. Release Tensioner: Allow the tensioner to return to its normal position. The belt should now be properly tensioned.
8. Check Tension: You should be able to twist the belt about 90 degrees with moderate hand pressure. If it's too tight or too loose, adjust the tensioner as needed.
9. Start the Engine: Start the engine and listen carefully for any squealing or unusual noises. If you hear squealing, shut off the engine immediately and re-check the belt installation and tension.
10. Lower Vehicle (if applicable): Lower the vehicle safely if you used a jack.
Important Notes:
* Belt Routing: Make absolutely sure you route the new belt correctly. Incorrect routing can lead to premature wear and even damage to engine components. Consult your owner's manual for the correct routing diagram.
* Tension: Proper belt tension is crucial. Too tight and it can damage bearings; too loose and it will slip.
* Type of Tensioner: Some tensioners are spring-loaded, while others use a hydraulic system or other mechanism. Understanding how your specific tensioner works is critical.
If you are uncomfortable performing this repair yourself, it's best to take your Tahoe to a qualified mechanic. Improper installation can lead to more serious problems.
