I doubt the original poster is still having the issue. But, atleast on the 98, you’ll want to kneel down outside of the vehicle, look deep under the dash toward the foot pedal and to the right. You’ll see something that looks like a small box with some levers connected to it leading under the dash. That’s the one you want. You can also try lifting those levers off the arms of the mixer door, and moving manually. It looks complicated, but you can’t mess it up. It’s a simple part.