Here's a general outline. Specific steps and torque specifications will vary depending on the exact engine (likely a 2.3L or 3.1L V6) and the type of tensioner you're installing (new or used). Consult a repair manual specific to your vehicle's year, make, model, and engine. A Haynes or Chilton manual will be very helpful.
Tools You'll Likely Need:
* Repair Manual: Absolutely crucial for specific instructions and torque specs.
* Socket Set: Various sizes, likely including metric.
* Wrench Set: Combination wrenches are helpful.
* Ratchet: A good quality ratchet will make the job easier.
* Torque Wrench: Essential for tightening bolts to the correct specifications. Using the wrong torque can damage the tensioner or other components.
* Jack and Jack Stands: To safely lift and support the vehicle.
* Wheel Chocks: For added safety.
* Pliers: Possibly needed to help manipulate certain components.
* New Belt Tensioner: Make sure you have the correct part for your vehicle.
* New Serpentine Belt (recommended): Since you're replacing the tensioner, it's a good idea to replace the belt as well. A worn belt could have caused the tensioner failure.
General Steps (Consult your repair manual for precise details):
1. Safety First: Disconnect the negative battery terminal. Support the vehicle securely with jack stands. Engage the parking brake and use wheel chocks.
2. Access the Tensioner: Locate the belt tensioner. This usually involves removing some components to get better access; your repair manual will guide you on this. This might involve removing some plastic engine covers, belts, or other accessories.
3. Release Tension: This is the most crucial step. Most tensioners use a bolt or a lever to release tension on the belt. Your repair manual will show how to release the tension safely. Be careful; the belt can snap back and injure you if you aren't cautious.
4. Remove the Old Tensioner: Once the tension is released, you should be able to remove the old tensioner. Note the position of any shims or washers – these must be reinstalled in the same order on the new tensioner.
5. Install the New Tensioner: Mount the new tensioner in the same position as the old one. Make sure everything aligns properly.
6. Install the Belt: Route the serpentine belt around all the pulleys, ensuring it's seated correctly on each pulley.
7. Tighten the Tensioner: Tighten the tensioner mounting bolts to the specifications outlined in your repair manual. Use a torque wrench to avoid over-tightening or under-tightening.
8. Re-Tension the Belt: Once the tensioner is mounted, re-tension the belt using the tensioner mechanism. There is often a specific procedure for this (check your manual!). The belt should have the correct amount of deflection when pressed in the middle.
9. Reconnect Everything: Reinstall any components that were removed to access the tensioner.
10. Check and Recheck: After reassembly, carefully check that the belt is properly aligned and tensioned. Double check all bolts are tightened to the correct torque specifications.
11. Reconnect the Battery: Reconnect the negative battery terminal.
12. Start the Engine: Start the engine and listen for any unusual noises. Check for belt slippage or any other issues. Let the engine run for a few minutes to ensure everything is working correctly.
Again, this is a general outline. Always consult a repair manual specific to your 1995 Pontiac Grand Am GT with air conditioning before attempting this repair. If you are not comfortable performing this repair yourself, take your vehicle to a qualified mechanic. A mistake could cause significant damage to your engine.
