Where is the fuse panel for the fan, (heater, air, vent), on a 2005 Buick LeSabre?

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Look inside the glove compartment for the vent control they are probably run by vacuum. See if they are leaking.

PWR WDO - 30amp circuit breaker , DRV -MDL 10amp fuse - both are located in the rear fuse box .
Fuse Block Rear
Under the left side of the rear passenger compartment seat

You can see whether the fan is turning and its condition by opening an access hatch. Open the hood and look for a plastic panel located above the passenger side firewall (the area where the back of the hood would lay when closed). Pull the two plastic hatch tabs back and remove the access hatch. You may have a filter that needs to be replaced if clogged. Once open and the optional filter is removed, you will see the fan wheel below. Clean out any debris that may have accumulated - make sure the car is off. Then turn on the heater or vent and see if the fan turns. If the fan turns but you have no air blowing in the car, there may be a problem with the air duct system. If the fan does not turn, it could be a blown fuse and defective fan motor.

These are actually the bulbs that have went bad. It would be quite expensive. I have a 2004 that has done the same thing. No lights behind any buttons any more except the ac heater controls I replaced last year.

I assume you already checked the fuses?
I also assume that you mean that the fan doesn't blow for heat or air.
I have similar cars: 2002 Impala and 2005 Bonneville. I've had to replace the fan on the Bonneville.
If fuses OK, check the power to the blower fan under the assenger dash (right about where the passenger toes would be). You'll probably have to remove the kick panel from under the dash; couple screws maybe. The center wire of the blower should have 12+ volts. If yes, you probably need a blower fan. If it's the same or similar to the Pontiac, there will be the one plug, a rubber hose and 3 screws.

Does this have auto temp control where you set the temp number or does it have a knob you set 1-5. I'll bet you have auto temp. and you need to replace the blower control module under the hood.

you probley need to replace the heater controls

This could be several things. First I would check that the thermostat is not stuck open. This will condition will make the car run cold when it is cold outside.

If this is not the case........and I'm assuming you've already checked that the antifreeze is full, make sure that the heater valve is working. If it is frozen in place then it won't move and won't allow the warm water to circulate through the heater core.

I'm basing my answers on a standard Lesabre. Yours may not have the standard climate control.

chech your relays and fuses for the ac cooling system on the fuse box, then check ac compressor