I've done this twice now, but note that the following is not professional advice. Professionals have the special glues and greases to do a clean and guaranteed water-tight job. On the other hand, their services tend to cost about $150, totally unjustified if you ask me.
1. I am assuming the old vent window is broken (it is a frequent target of auto burglars). Start by removing the remains of the window and its gasket. Clean out broken glass from the gasket, door, and vehicle as necessary.
2. Place the new vent window into the old gasket. However, it is preferable to have a new gasket if possible.
3. Roll down the passenger window all the way on the door you are working on. Grab the main window gasket in the top back corner of the window, and pull it away from the door frame. Doing this will reveal a Phillips head sheet metal screw that fixes the metal divider between the two windows to the door frame. Unscrew this screw.
4. Push the divider towards the front of the car to release the hook that holds it in the frame. A flathead screwdriver can assist in this sometimes.
5. Now that the divider is moved some, you can slide the new window, in its gasket, into place. Sometimes another person to help is a good idea, since you need to push the window down while making sure its gasket is going into place properly.
6. Replace the window divider, screw it back down to the door frame, and replace the main window gasket where you pulled it away from the door frame.
-Carl Willis
505-412-3277
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