That being said, if you're determined to do it yourself, here's a general overview. This is NOT a complete guide and you must consult a repair manual specific to your 1999 Oldsmobile Alero's transmission type (check your owner's manual) for precise instructions and torque specifications. These manuals are available online or at auto parts stores.
What you'll need:
* New Transmission Fluid: The correct type and amount are crucial. Your owner's manual or a parts store using your VIN will tell you the exact fluid specification (Dexron III or Mercon, likely). Purchase enough for a complete drain and fill, which might require multiple changes to fully flush the old fluid.
* Transmission Drain Pan: A large enough pan to catch the old fluid.
* Wrench(es): The correct size for your transmission pan drain plug and fill plug. Likely 10mm, 12mm, or 1/2" drive sockets.
* Funnel: To pour in the new fluid.
* Jack and Jack Stands: To safely lift the vehicle.
* Torque Wrench: Essential for properly tightening the drain and fill plugs to prevent leaks.
* Gloves: To protect your hands from the hot fluid.
* Rags or Shop Towels: For cleanup.
* Optional: A transmission fluid pump (for easier filling) and a drain plug gasket (if it's reusable).
General Steps (Consult your repair manual for specifics):
1. Safety First: Park on a level surface, engage the parking brake, and chock the wheels. Wear safety glasses.
2. Locate the Transmission Pan: It's usually located underneath the transmission toward the front of the vehicle.
3. Warm Up the Transmission: Run the engine for 10-15 minutes to warm the fluid, making it flow more easily.
4. Raise the Vehicle: Securely lift the vehicle using a jack and jack stands. Never work under a vehicle supported only by a jack.
5. Locate the Drain Plug: Carefully loosen and remove the drain plug, letting the old fluid drain into your pan. Be prepared for hot fluid.
6. Remove the Transmission Pan (Often Necessary): You may need to remove the transmission pan to access the filter, if it has one. Many bolts secure the pan; take note of their positions. Some fluid will spill, so be prepared.
7. Replace the Filter (If Applicable): Replace the transmission filter if your Alero's transmission has one.
8. Clean the Pan (If Removed): Clean the pan thoroughly and replace the gasket if necessary.
9. Reinstall the Pan: Carefully reinstall the transmission pan and tighten the bolts evenly to prevent leaks.
10. Locate the Fill Plug: It is usually on the side of the transmission, near the top.
11. Add New Fluid: Carefully add the new transmission fluid to the correct level. Consult your repair manual for the fill procedure and the correct fluid level. You may need to use a pump for easier access.
12. Check the Fluid Level: This can be tricky. Consult your manual for the correct procedure, often involving removing the dipstick (if present) while running the engine.
13. Lower the Vehicle: Carefully lower the vehicle using the jack.
14. Test Drive and Recheck: Test drive the vehicle and then re-check the fluid level.
Important Notes:
* Multiple Drain and Fills: A single drain and fill will only partially replace the fluid. For a more thorough flush, you may need to repeat this process multiple times over a few days, driving between each fill to circulate the fluid.
* Transmission Fluid Type: Using the wrong type of fluid can severely damage your transmission. Be absolutely certain you use the correct fluid.
* Professional Service: If you are not comfortable performing this task, take your Alero to a qualified transmission shop. The cost of repair from a botched transmission fluid change could far exceed the cost of professional service.
Remember, this is a simplified overview. Always consult your vehicle's repair manual for detailed, specific instructions before attempting this repair. Safety is paramount.
