change display from farenheit to celsius

1994 Buick Roadmaster. In daylight I can see that there is a Celsius icon in the display, so there must be a way to change it to showing temperatures in Celsius instead of Farenheit. Does anyone know how to do that?

/Peter, SWEDEN

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Peter
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My 97 Astro has that above the windshield with a button.

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AstroVan

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