Q: temperature gauge dosnt work

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What do i need to do to make the temperature gauge work

My car has 180000 miles.
My car's transmission is unknown to me.

The temperature sending unit is on the front right side of the engine. Disconnect the single wire and turn the key on and see what the gauge does. Now hold the single wire to a good engine ground and the gauge should go all the way one way, then all the way to the other if the gauge is working. If the gauge does not work when you do this test, then a mechanic would need to remove and test the temperature gauge. If the gauge did move during the test then the sending unit on the engine may be the reason the gauge is not working correct. If you need help checking this, a technician, such as one from YourMechanic, can visit your car’s location to diagnose the temperature gauge and determine what repair you will need.

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