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Re: 2000 Saturn SW cooling fan
Since u replaced the sensor and the relay and the problem is still there,u need to check the wiring circuit to the fan, because u said that when connected direct it comes on.
It could be that there is a break or slack connection in the circuit.
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Yes we had a Saturn which we thought was running hot and the gauge was always in the centre or over but we had the fan checked and it was working. Our thermostat might of been faulty but we never had a overheating issue..My Mechanic said that we should get a coolant flush that might help.
Well, the overheating at an idle would normally be caused by your cooling fan not engaging. I would first check to see if you fan is working by turning on your a/c (this will override the fan sensor and turn it on before it gets above operating temperature). If it doesn't come on you should check your AUX. Fan Relay. If thats ok, you probably need a new fan motor but first replace your coolant temp. sensor as this is an inexpensive parts and may save you quite a bit of money (also your vehicle may be running at the normal temperature but your temp sensor may be sending a signal telling you it's hot). This will explain why it was overheating at an idle. As far as it overheating while driving, you should first check to see if your water pump is leaking and make sure your belt is intact. If the water pump pulley is not spinning your belt will be glossy from excessive heat from friction. If your water pump is good and you can spin the pulley by hand, you should then consider when the last time you replaced the thermostat as it may be stuck closed. also your radiator may have some blockages in it so I would replace the thermostat, drain the coolant by removing the lower hose and spray a hose into the radiator until the water comes out looking pretty clear. I hope this helps you figure this out.
The car overheats because the fan system is not working. The engine coolant sensor tells the computer to turn on the fan when it gets hot and also sends temperature readings through the computer to the heat gauge. Try turning the AC on if you have it--it should immediately start the cooling fan. If nothing, check the fan fuse and relay. It's also possible that the fan motor is frozen due to bad bearings. Try replacing the coolant temperature sensor to see if that restores the gauge readings. Hope some of this helps!
Check the wiring and connections on the coolant temperature sensor that I believe is on the thermostat housing. If they look good, replace the sensor. It is pretty rare to have an electric cooling fan motor fail but not impossible. They are usually very expensive. Expensive enough that you will want to make sure that is the problem before you replace it. Usually the sensor will fail. **Please rate me on this answer.**
Definately have a sensor problem...but that may not be all. You can blame the sensor issue on the idling problem. The overheating in park is likely one of 2 things, provided you have adequate coolant. #1 a sticking thermostat or a bad coolant temp sensor not activating your fan at idle. What you should do is have your diagnostic codes read in order to take care of the sensor issue. Most national parts chains such as Auto Zone or Advance will do this at no charge in hopes of selling you a sensor. Good Luck! I hope you find this to be very helpful.
This is most likely caused by a bad sensor in the radiator. I have never repaired this on a ford focus so I can't tell you where the sensor is located but if you find the sensor and then make a jumper wire and remove the wire from the sensor and jump the two wires together and turn the car ON (don't start the car) if the fan runs, the sensor is bad and must be replaced.