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it can be one of three things . a fuse , gauge, or sender. try puting a loop wire in the connector that goes to the switch on the thermostat housing do not reconnect until you turn on the ignition if the gauge now works then the problem is the sender . if it dos not then take loop wire out and reconnect . now find the fuse that supports the temp gauge and make sure its ok. if it still does not work its the gauge voltage regulator so the gauge will have to be replaced. hope this is of help kiffie

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Q: Why is the temperature gauge not working when engine is hot in a ford escort mrk 6?
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