1. Gather Tools and Parts:
* New Rear Window Motor: Make sure you get the correct motor for your 1999 Malibu. The part number will be crucial.
* Panel Removal Tools: Plastic trim tools, flathead screwdriver (preferably non-marring), possibly a small pry bar (use cautiously!).
* Screwdrivers: Phillips head and possibly flathead.
* Socket Set (Possibly): Depending on how the motor is secured.
* Wrench (Possibly): Same as above.
* Electrical Tape (optional): To secure any loose wires.
* Repair Manual (highly recommended): A Chilton's or Haynes manual for your specific vehicle will provide detailed instructions, diagrams, and torque specifications.
2. Door Panel Removal:
* Disconnect the Battery: This is crucial to prevent electrical shorts.
* Remove Interior Door Handle: Usually involves removing screws or fasteners.
* Remove Window Crank (if applicable): May require removing a screw or clip.
* Remove Door Panel: Begin by carefully prying the panel away from the door, starting at the edges. There are usually clips and fasteners holding it in place. Work slowly and deliberately to avoid breaking clips. Your repair manual will show the location of these clips and fasteners.
* Disconnect Electrical Connectors: Once the panel is loose, unplug the connectors for the window switch, power lock, and potentially other components.
3. Accessing the Window Motor:
* Remove any remaining screws or fasteners holding the window regulator assembly in place. This might involve removing the inside door handle mechanism, or other components that are in the way. Your repair manual is essential here.
* Locate the Window Motor: It is usually attached to the window regulator.
4. Replacing the Window Motor:
* Disconnect the old motor's electrical connector.
* Remove the old motor: This may involve removing screws or bolts, depending on how it's mounted. Take note of how it's connected to the regulator.
* Install the new motor: Make sure it is correctly aligned and seated in the same way the old one was.
* Reconnect the electrical connector.
5. Reassembly:
* Reinstall the window regulator assembly.
* Reattach the door panel.
* Reconnect all electrical connectors.
* Reconnect the battery.
* Test the window: Make sure it works correctly.
Important Notes:
* Take pictures: Before disassembling anything, take pictures so you can remember how everything goes back together.
* Be gentle: Avoid using excessive force, as you can easily break plastic clips or damage other components.
* Consult your repair manual: This is the most important step. The steps outlined above are general and may vary considerably based on the specific model of your 1999 Malibu. Your repair manual will have detailed instructions and diagrams specific to your car.
* Professional Help: If you are not comfortable with this type of repair, it's best to take your car to a qualified mechanic.
Attempting this repair without a repair manual greatly increases the risk of damaging your vehicle. Using a repair manual is strongly advised.
