1989 Oldsmobile 98 headliner installation instructions. The door post trim on the 98 takes some figuring out; but this vehicle isn't really that complicated when it comes to installing a headliner. It will take approximately 2 to 4 hours to install this headliner depending upon how handy someone is with their hands. A full size headliner kit will do this car; click this link to go to the order page.

SAGGY	Remove the visors, clothes hanger hooks, and consoles; this console has one screw that holds it up. Remove the screw and slide it forward. It has a wiring connecter that unplugs.
The door post trim comes loose in sections; pry this piece on both sides loose at the top; it has metal clips that fasten to the car body.	This piece clips together; pop it loose and remove it.
The trim along the edge of the headliner is one piece from the rear of the car to the bottom of the dash at the front; pull it down and off.	The rear panels have plastic plugs at the top and bottom; these are removed by pulling the panel away from the body.
The headliner has some velcro in a few places that holds it to the top of the vehicle; wiggle it and the velcro will come loose and drop down. Remove the board through the passenger front door. (98% of all headliners are removed this way)	Someone tried to reglue this old headliner -- not only won't it hold; it will harm the board when the headliner is replaced.
Apply the material; either 1/2 at a time or 1/3 at a time -- whatever you are comfortable with.	Fold the cloth over and glue it on the front and rear; trim the excess cloth off on the sides; and cut the holes for the visors, hangers, and console.
Slide the board back in and put everything back like it was -- and it is like new.

1989 oldsmobile 98 headliner repair guide, olds 98 headliner installation guide