How do you replace blend door 98 Oldsmobile aurora?

To replace the blend door in a 1998 Oldsmobile Aurora, first disconnect the battery and remove the dashboard trim to access the HVAC controls. Then, take out the heating and air conditioning unit to reach the blend door assembly. Remove the old blend door and install the new one, ensuring it is properly aligned. Reassemble the HVAC unit, reconnect the battery, and test the system to ensure it operates correctly.