Temp gage in cluster shows the temp cold all the time. 2008 ford focus se. Dealer just replaced the thermostat, didn';t solve problem.

Is located on the cylinder head

Just for testing, you could use a resistor in place of sending unit. one resistor represents cold, the other hot. If gage reacts properly then the wiring--temp gage and instrument cluster should be ok. If not, then you have a problem in areas mentioned. You can get resistors at places like radio shack. Just a thought. good luck.

Hi Chris, sounds like your thermostat may be worn and not closing all the way which would cause your engine to run cool at times. If you have a temp gage it should tell you if the engine is actually warming up or not. If not I would replace the thermostat.

Do you have a temperature gage in your instrument cluster? When the temp goes cold, does the temp gage rise? Check your coolant level both in the radiator and the coolant recovery tank under the hood, and fill as necessary. If that is OK, then check your serpentine belt for wear and/or slippage around the water pump. Lastly, if you have a temp gage and are noticing fluctuations in the reading, you may need to replace your cooling system thermostat. Good luck.

sounds like you have air bubbles in the system

autozone will scan your engine code for free. the thermostat is located under the nipple that the large hose coming from the top of the radiator clamps too.you can have your radiator flushed for about $80 just about anywhere.

you may have a stuck thermostat,if all fans are working then just flush out radiator and replace
thermostat.check for any coolant leaks and check coolant level after few days

i think if a wire that is + on the gage and it is making contact with the ground it will do that.

replace temp sensor and thermostat.
sounds like your engine has been over heating while the gauge was not working.

It will probably be your thermostat that is jammed open , try fitting a new one , the thermostat is located in the housing on the side of the engine usually just above the gearbox , trace the top radiator hose to the engine and you should be able to find where the thermostat is ,