My Temperature guage on the dashboard do not move , whats the problems. on 1994 Buick LeSabre

My Temperature donot work on dashboard but my other guages
are working.

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3 answers
It could be the temperature gauge sender unit has failed or if it moves but does not approach the middle of the gauge after five minutes of running the thermostat in the cooling system may be "stuck open".
temperature sensor
or the wires going to the sending unit may be disconnected