If the engine is not warming up, the thermostat may be stuck open.
If the engine is warming up and the gauge is not moving, the problem could be the sending unit for the gauge or the gauge itself.
SOURCE: temp gauge cold and then heat turns not so hot
make sure the antifreeze is full. if so, replace thermostat and refill
SOURCE: Temp gauge stay on cold.
Switch ig. on, ground the sender unit wire for about 3 seconds see if the temp. gauge moves, if so change sender unit, if not then it is a faulty gauge reader.
SOURCE: 2004 Nissan Maxima temp gauge fluctuation
well the temperature control gage is connected to the engine block and consists of 1 wire for the reading of the motor heat either the sensor is going bad or you need to check your coolant levels in the radiator make sure the engine is cool before opening the thermostat cap to the radiator so not to get burnt ...also make sure the wire itself is not grounding out on the engine block to give the gage to give such a readout look to the engine and usually on the drivers side lower the plug wires you should see a plug with a wire coming from it ensure the wire is not rubbing on anything .
SOURCE: 2001 nissan altima temp.gauge not
Sounds like a Temperature Sending Unit is at fault. They are usually located by the thermostat and are screwed into the intake manifold and have 1-2 wires coming from the plug that is plugged into the sensor. Usually a pretty easy fix.
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