I have a 1982 cutlass supreme and the diagram in under the hood on a front panel, If not someone may have removed it.
You can find a detailed vacuum hose schematic for a 1984 Oldsmobile Cutlass Supreme in the car's owner's manual. You can also check with local auto stores.
95 Cutlass service manual. Try Helm.
The emissions decal on the fan shroud will have a crude diagram telling you what goes to what. Also, a chassis manual(factory service manual) would have it, and possably a chiltons book. -Martin Deutschman Stop by www.oldspower.com they can help you out.
the diagram you are looking for is on the fan guard connected to your radiator
Try a JC Whitney catalog. I think they have a www but I dont have the link.
on the sticker under the hood
The diagram is in your left sock.
Volume 4 section 14 of the shop manual
Check for a vacuum leak either under the hood or under dash Check the operation of the vacuum actuated motors under the dash Check the operation of the selector switch in dash Defrost is the default position for this system
Alldata, haynes manual, or the sticker on the hood.
Look under the air filter and mounted on the transmission facing the radiator is a gray and round metal valve with a vacuum line attached.
Get a chilton manual its in the back of the book its well worth it there 25.00.