It sounds like the guage is working fine. Since you have little or no heat when you say the guage isn't working it sounds like the thermostat is getting stuck open causing your coolant to be constantly cooled (it isn't closing so the engine can warm up sufficiently to provide heat). Replace your thermostat and I bet your problem will go away.
most likely the gauge
Low Coolant? Weak Temerature sensor? Weak gauge Gauge working properly and recording the thermostat opening and closing as engine temperature fluctuates
try replacing the thermostat
The temperature gauge on a car fluctuates because the car's thermostat is opening and closing. The gauge goes up when the thermostat closes and the gauge goes down when the thermostat opens.
Is vehicle actually overheating? Could be a bad temperature sending unit or gauge Check temperature with a thermometer If thermostat does not open vehicle will overheat
Thermostat is sticking.
i change the thermostat and the temp switch but still not working
it will be the guage coolant sensor situated on the thermostat housing,its a common problem. ************************************************ Is that to say that the gauge is broken, or that it can be repaired by freeing it and covering it in WD40?
Either the thermostat is not working properly or the temperature sensor is displaying wrong on your gauge.
You may need anew thermostat or the fan has stopped working.
It is possible that the temperature gauge has stopped working in a 1992 Tempo due to a blown fuse. It is also possible that the temperature gauge stopped working do to the temperature sensor in the engine having a short.
Sounds like the thermostat is sluggish to react to temperature changes
An automobile temperature gauge can fluctuate when the thermostat is opening and closing erratically. The temperature gauge can also fluctuate when the ground wire is loose.
Temperature gauge not moved and the fan's always are working
Your thermostat is getting stuck, replace it.
It is located to the left of the thermostat housing for the temperature gauge, there is another to the right of the thermostat housing for the computer.
Are you referring to the Temperature Gauge Sending Unit if so The sending unit is located in the front section of the manifold in the vicinity of the thermostat.
You most definately unpluged the sensor wire. It's a single red wired that plugs onto a sensor just passed the thermostat.
Have you checked for leaks? also the cooling fan may not be working.
Broken thermostat. Common Chrysler problem. Replace the thermostat.
If your thermostat isn't working then the gauge on the car won't work. You may also notice that your car runs hot.
1990 Chevrolet Lumina temperature sender is located on the back side of the thermostat housing. The sender has a wire that goes to the temperature gauge.
should be right around the thermostat housing
Thermostat is gone, change it
If your engine thermostat sticks open it will run cooler on your temperature gauge and you won't see the temperature gauge go up to the point where your engine thermostat opens and then the temperature gauge will show a drop in temperature , your check engine light will probably come on , your gas mileage will be less , the heat from your heater probably won't get as hot If the engine thermostat were to stick in the closed position your engine will overheat ( but there are several other causes for an engine to overheat )