Tempreature gage

My temperature gage in my1999 ford taurus has stopped working and my heat seems to be not as hot as it was. Can it be a fuse? If not what can it be?
If anyone has an idea, please reply. Thanks,
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Change the thermostat; it's probably stuck open. Don't try to "fix" it, just change it out for a new one.
rickcovery wrote:

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