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only 3 reasons a temp gauge wont work the temp sender is bad the gauge is bad or the wire from temp sender to gauge is broken
Because they are broken is one reason
It's broken
You sure it is the gauge that is broke? I bet it is the sending unit.
could be a bad sensor a bad gauge or a broken or disconnected wire
Broken Temp guage
temperature gauge not working can be caused by a bad temp sensor in engine, a bad gauge in dash, or a bad fuse
If you drive the car 10 miles, and it doesn't move.
You need to replace your thermostat to get your temp gauge to work. You can go to a salvage yard and get a replacement seat belt.
Because the gauge is broken.
why doesn't my rpm gauge and temp gauge, fuel gauge not work
The temperature gauge is broken or not calibrated. You need to have your heater or thermostat regulated and/or looked at.