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Achievas where only made from 1992 to 1998
The fuse box for a 1998 Oldsmobile Achieva is in between the dashboard and the driver's side door.
Which engine?
Under the hood in a big black bulky fusebox.
Mounted on top and inside the fuel tank.
the O2 Sensor Should be on top of your exhaust manifold
in my 89 Oldsmobile delta 88 , the heater motor was directly under the center of the windshield under the hood. black circular thing.
No they will not, the achieva has a bolt pattern of 5 lug on 100mm whereas the camaro is 5 lug on 4 3/4"
In the trunk on the cover that is over the spare tire you will find a sticker with that information..
May be a defective thermostat or heater core
it is located on the right side of the passenger compartment of the vehicle you would have to remove the whole dash in order to replace it so if you have to ask where it is you probaly won't be able to replace it.