Possibly a leak in the coolant reservoir bottle.
Could be temperature sensor Could be gauge
could be the temperature sending unit
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.
mostly likely something wrong with the sensor or gauge.
Possible intake manifold gasket!!! Hope you have a warranty
could be a number of things, more than likely the sensor, the wiring or the gauge itself, i'd take it to a garage then you can blame them if it goes wrong :P
check the connections behind the gauge they could pop loose
i have a 1999 ford escort zx2 and its running hot, changed out the thermostat thermostat cooling sensor, checked the fan and it works, the temperature gauge in side the car still showing hot, let thecar set over night and the gauge still shows hot, what else could be wrong
No - the gauge reports 'real-time' the engine temperature. If it is wrong, there is a problem with the sending unit on the engine. This is a pretty easy fix...
Mine was a bad ground on the gauge. Easy check by any certified mechanic.
There could be several things wrong with the system that the thermostat gauge is connected to. You could check to see if the gauge is working correctly. If the gauge works fine, then it could be the housing that the thermostat is mounted to. It could also be a faulty bypass valve near the thermostat which prevents the engine from heating up. Check these places to see what may be wrong with your escort.
If the outside temperature gauge is not reading the right temperature on a Buick Regal, perhaps it has become damaged. It can also not read the right temperature if it is wet or covered with dirt or snow.