i change the thermostat and the temp switch but still not working
If your temperature gauge isn't working the problem is a bad gauge, grounded or disconnected wiring or, most likely, the temp sender isn't working.
probably the sensor
Check your grounding on your temp sending unit.
Because they are broken is one reason
Temp. sensor my have stopped working. Quick and fairly easy fix.
Probably the temp sending unit.
Could be temperature sensor Could be gauge
bad temp sender usually. Bad gauge rarely.
Likely a bad ground in the relay
Please visit the dealer to get these problems fixed.
why doesn't my rpm gauge and temp gauge, fuel gauge not work
You temperature gauge could be not responding because of a faulty fuse. If you check your fuses and they work then you may have an electrical problem.