Well i went to a parts store and my brother inlaw bought a sensor and it was for the thermostat(only)mind you a parts store,well it didnt work .i took every thing apart on it, the only thing i see wrong is the relay could be bad, the fans run, the fuses are good.what do you all think???
I believe that the problem you are encoutering is a bad SSR (solid state relay). This device is wired in series with the fans and causes them to run at various speeds depending on engine needs. It is quite common that these devices fail. I would look at trying to get a new one...not sure of the cost but very easy to replace yourself.
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With the thermostat out you should see a lot of circulation. If not investigate water pump. Is the fan electric fan working? Bypass the relay and run the fan whenever the engine is running. If it doesn't overheat with the fan running then investigate fan control. make sure the coolant is topped off and use a thermometer in the radiator to verify temperature.
a temp sensor only monitors what the engine temp is it will not cause the engine to overheat or run hot. check to make sure the rad cooling fan is working if not it could be a bad fan motor, temp sensor for the computer to turn on the fan or a fan relay. there are 2 temp sensors on motors. one is for the gage or light the other is to tell the computer to turn on the cooling fan.
I dont know what year model you have but the newer one will run when car is turned off to cool radiator. Maybe you have a radiator problem if this just started to happen. Is the car over heating. Did you check radiator fluid or thermostat. I dont know much about your car and year model but i would do these checks. Maybe radiator needs to be flushed. You can use aluminum brite for to flush. Can buy it at O Reiley's. I had to flush my daughters radiator about 10 times when we bought it used, fithy. Looks brand new. Please dispose of chemicals properly. It is an acid.
Is you coolant leaking out on to the ground? When you fill it does the coolant look low. If it's not leaking out and there are no puddles on the ground it could be a head gasket starting to go or has gone bad. Is it overheating to the point that steam is bellowing out from under neath the hood.
Having similar problem with an 03 Liberty. Replaced Radiator Cooling Fan Relay $82 and drill new mounting hole. Fan will not run after shutting off engine, so I'm thinking I have a bad thermostat or a bad cooling temperature sensor. Heading to the parts store now.
check fluid level in radiator are you leaking fluid on ground does cooling fans come on if they dont check fuse for fans if fuse is good inspect wires going to fans are fan motors bad is water flowing thru engine anfter thermostat opens if notcould be bad water pump is there water on your oil dip stick if so blown head gasket dont keep driveing hot
REPLACE THERMOSTAT.ITS STICKING CLOSE TO KEEP COOLANT FROM CIRCULATING THROUGH ENGINE AND RADIATOR. THE FANS SHOULD COME ON WHEN VECHICLE SETTING AT A LONG IDLE.THE COOLANT TEMPERATURE SENSOR GET TO CERTAIN TEMPERATURE WHICH WILL COMPLETE CIRCUIT PCM SEND POWER TO COOLANT SENSOR THEN TO COOLANT FANS RELAYS AND FANS.IF VECHICLE OVER HEATING WHILE MOVING THERMOSTAT FAULTY.IF YOU TURN AC AND COOLANT FANS DONT RUN CHECK COOLANT FANS FUSE AND RELAY.IF COOLING FANS DONT TURN ON WITH AIR CONDITIONER ON EITHER COOLANT TEMPERATURE SENSOR FAULTY OR PCM FAULTY.IF ALL LOOKS GOOD.IF ENGINE OIL LOOKS LIKE MILK SHAKE.YOU HAVE BLOWN HEAD GASKET.