There are two Blend Door motors. One each on the left and right side of the heater box located in the center of the dash. If one side is blowing hot air, it probably has a broken gear in the motor on that side.
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Passenger side firewall
The heater fuse on a 2000 Buick Century is located on the right side of the engine compartment, in a water tight box. It houses many of the major fuses for the vehicle's electrical system.
Under dash, passenger side, inside the vehicle, mounted on the firewall.
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Inside the vehicle, under the dash, passenger side, next to the firewall. Raise the hood and find the heater hoses going to the heater core. This will tell you the location inside the vehicle.
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