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To change the dash light bulbs you must remove the instrument panel.
I had this problem and it was a bad alternator.
Fuse for headlights 1990 Chevrolet suburban is located on the driver's side dash on left right behind the fuse panel. It is just above the parking brake.
I have not seen a standard Chevy Celebrity with a toggle switch under the dash. I would suspect that is something a previous owner installed.
The flasher for the turn signals is located on what Chevrolet calls the convenience center. It is located behind the dash to the left of the steering column. It is anything but convenient to get to.
IT is located under the dash above the accelorater petel
The fuse box is on the bottom of the dash on the right side of the steering column.
It may be wired wrong.
No, its a bad earth somewhere
Heater core has air in it and or plugging up.
The fuse panel on Chevrolet Celebrities is on the bottom of the dash to the right of the steering column.
To change the high beam indicator you have to take the instrument cluster out of the dash.