I have an '01 Regal. They should be pretty close in construction.
On my car, the relay is in the fuse box and the fuse box is under the hood on the passenger side. It is a rectangular black box near the battery and may have a small red boxy-looking cover on top of it with a thick black wire coming out the top.
The little red box is broke on my car, but I think it has to be removed before the fuse box cover can be removed.
The box should be marked "FUSE" and has a knob in the center. Turn it CCW to unscrew it and pull the cover off.
Inside the cover is a label with identification of the components including the relays that energize a large portion of the car. There should also be spare fuses and a puller tool.
This is essentially the 'heart' of your car's electrical distribution system.
Be careful because high currents at low voltages are present and exposed with the cover off. Put the cover back on when your done.
The 2000 Buick Regal cooling fan circuit relay switch can be found in the fuse box. The fuse box is located in the engine compartment.
GM vehicles are not equipped with an inertia switch.
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1000 lbs according to edmunds. Link: http://www.edmunds.com/used/2000/buick/regal/100274235/specs.html
Check out this link. It includes pictures. I am certain your 2000 Regal will be very similar if not identical to the 2001. http://www.clubgp.com/cgi-asp/mods.asp?modid=141
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