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Focus overheats but the temperture gauge inside on the dash stay in the middle and is there a temperture sensor on the engine and if so where is it also the fan does not run and car overheats fans run only with airconditioner on
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Locate the temp sensor in the coolant system and take a good look at it. Make sure it is firmly fixed in place and the wires to it are clean and not corroded. If its ok, check the connectors to the dash for damage.
If the engine really is not heating up, the thermostat could be stuck open. Or you could be low on coolant and the gauge is not reading correctly. Or if the engine is warming up, the sensor for the gauge could be faulty.
Because you have done so many repairs already I would most likely say that the gauge is defective. I would use a manual temp probe and probe the coolant temp after the car has reached operating temp. Coolant will be between 180- 230 degrees. If coolant temp checks out and you can see coolant moving in radiator and the vehicle does not overheat then you will need either a gauge or a coolant sensor. To locate the sensor it should either be mounted in the thermostat goose neck housing or the intake manifold.
the temp sensor is the trigger for the fans!!
the thermostat may be in upside down??
check new thermostat in a pot of water & heat it up watch that it opens up when it heats up should be at aroun 96 degrees F
otherwise the radiator may need a good clean out or a recore!
there my be a blocked water gallery so engine may need a flush aswell
Cheers Rob
That is the temperture control sensor to start the fans at the radiator. they have another sensor called the Engine Temperature Sensor.It is also located at the top of the engine.
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