You will have to open the door panel too complicated to describe. Watch You tube videos and search for replacing windows motor plenty of videos and this might help.
The Buick Roadmaster was not produced in 1986. They were made from 1991 to 1996.
A 1992 Buick does not have an inertia or fuel cut off switch.
It is not equipped with an inertia switch.
Remove retaining nut
fuel pump keeps running after the key is out what do I need to check I have to remove the fuses to stop the pump.
how to replace window toggle switch 1999 buick century
Remove the fuel tank to gain access to it.
Remove the grill
To change the ignition switch on a 1992 Buick Roadmaster, start by disconnecting the negative battery cable to ensure safety. Remove the steering column covers, then locate and unbolt the ignition switch, which is typically mounted on the steering column. Disconnect the wiring harness from the old switch, install the new ignition switch in its place, reconnect the wiring, and reassemble the steering column covers. Finally, reconnect the battery and test the new switch.
Low freon
Remove the crossmember and drop it out the bottom no problem.
How to unlock a buick roadmaster