thermostat problem on 2004 Hyundai Sonata

lately my car has been getting hotter than than normal but it eventually cools back down. I think it would be time to change the thermostat.Where is it located on my 2004 sonata v6 and how much will the part cost.

Asked by for the 2004 Hyundai Sonata
It takes about an hour to change the part is $20 antifreeze $18.
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