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Usually passenger side behind glove box
check heater motor
depends on the model. Is it a delta 88, or an achieva, or what!
How can I put 24s on 1981 delta 98
in my 89 Oldsmobile delta 88 , the heater motor was directly under the center of the windshield under the hood. black circular thing.
The cooling fan on a 1993 Oldsmobile Delta 88 is located behind the radiator and the wires are attached on the left hand side. The relay is located on the frame near the left headlight.
Probably the heater core, it is a beast of a job to do, but is gratifying to say the least. If the is a smell of antifreeze you can almost bet it is the heater core.
under the coil packs which are located at the rear of the motor on top
if there is a lot of snow or ice on these vents located at the bottom of the wind shield under the wipers that could be the problem if you live in a cold environment.
The 1989 Oldsmobile EGR valve is located on the top of the engine, near the back. It is quite simple to change.
The turn signal flasher on a 1975 Oldsmobile Delta 88 is located in the steering column. There is a small door panel on the underside of the steering column that is held on by clips. Both the turn signal flasher and the hazard flasher are located here.
They are generally located close to or near by the blower motor.