Therefore, double-check your under-hood fuse box. It's likely you just missed it. The relay might be labeled, or you might need to consult your owner's manual or a wiring diagram to identify it. The diagram will show the relay's location and sometimes even include a picture.
If it's truly not under the hood, the next most likely place would be a secondary fuse box, sometimes located in the trunk or behind a kick panel inside the car (though this is less common on a 1991 Acclaim).
If you can't locate it, a mechanic or auto parts store with access to repair manuals for your car's year and model will be able to help you pinpoint its location.