2001 Parkavenue Exterior Temp

I have a 2001 Parkavenue, the other day after the warm temps the climate control exterior temp keep showing 112 degrees, it goes up higher, it dont seems to come down, even at night time it still reads 108 degrees, where
might i be able to start to diagnost this problem.
Thank
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There is a part called a sensor or thermosensor or thermocouple that is behind the grill, more than likely that is you problem.

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