Clicking noise under dash and front defroster not working?

Very common issue,noticed on many brand model vehicles.n this particular case,my customer noticed the problem on his 2008 Ford Taurus.

In his case,the frost defroster stopped working.
The heat and cooling were working but only for dash vents and not for floor vents.Also a clicking sound was head and that is from under the dash.

On the basis of this problems,the details are as follows :------

It sounds like the mode door motor bad and thats whats making the clicking noise.Its located under the drivers side of the dash .You will see three 8 mm bolts that hold it in place, part is approx under $80 at the dealer, see pic below for better understanding :-----------

This details will help.

Thanks.

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