The blower motor is removed from under the hood. Against the firewall just to the left of center you will see the blower sticking out. Five 5.5mm bolts hold it on.
It is in the middle of firewall between the engine compartment and the passenger compartment.
in my 89 Oldsmobile delta 88 , the heater motor was directly under the center of the windshield under the hood. black circular thing.
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.
The heater core may be stopped up. Try flushing it, or replace it.
How to change a timing chain in a 1998 Oldsmobile delta 88
if not your fuse, check the fan/blower relay.
To replace the blower motor resistor in a 1998 Oldsmobile 88, first disconnect the negative battery cable to ensure safety. Then, locate the blower motor resistor, which is typically found near the blower motor under the dashboard on the passenger side. Remove the screws securing the resistor, disconnect the wiring harness, and take out the old resistor. Finally, install the new resistor by reversing the steps, reconnecting the wiring, and securing it with screws before reconnecting the battery.
Directly behind the engine, on the middle of the firewall.
$65.00
They are generally located close to or near by the blower motor.
under the hood on the fire wall.
Screwed into the heads.