the best way would be to locate the horn and disconnect (pull) one of the wires off of it. your horn fuse may work with other electrical items, so its best to disconnect from horn itself. hope this helps!
How do you change the heater core on a 1989 Oldsmobile Cutlass Ciera? or where can I get the Info on replaceing it
you can pull the fuse in the fusebox that controls it or you can find the horn and pull the wire off of it.
The 1989-1997 Oldsmobile Cutlass Supreme has fairly unique "1/4" side lock" wiper arm attachments. See Sources and Related Links below for installation videos. Also, purchase the replacement blades first and there will be additional instructions/illustrations on the replacement packages. Its very easy.
Try nada.com
In the fuel tank
Why is the electric coolant fan in your 1989 Oldsmobile cutlass cierra not working?
turn off the radio, press "set" then adjust with the scan and seek buttons
Chain
fuse
300.00
59 Liters or 15.59 Gallons
Where the stick is.