'97 Ford Taurus Wagon - stuck on heat

Hello,
I have a 1997 Taurus Wagon and the heat is stuck on even when I turn on the air conditioning or vent, it just keeps blowing hot air only. I
have around 60,000 miles on it and not sure what the problem can be.
Does anyone have any suggestions?
Thanks in advance.
John
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John wrote:

noise when adjusting the knob. (a small plastic gear was broken inside the actuator) You can see it under the dash right in the middle, it has a small arm going from it to the door. It is white plastic about the size of a deck of cards. I did have to remove the clove box door to get to some of the screws out but overall an easy job.
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