Question about 2001 Ford Focus

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ENGINE COOLANT FAN NOT CUTTING IN

OVER HEATS COOLANT FAN NOT CUTTING IN FITTED NEW ECM THAT DID NOT WORK TEMPERATURE GAUGE READS NORMAL BUT ON LIVE DATA TEMPERATURE READS 104 ?

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  • ERIC SPASHETT Oct 13, 2008

    I HAVE NOW FIXED MY PROBLEM BY FITTING NEW CHT SENSOR,{ FAN NOW CUTS IN OK} HAD TO REMOVE ALTERNATOR TO FIT SENSOR AT BACK OF HEAD

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On my 2001 Focus Zetec 2.0L, the radiator fan only worked with the air conditioning turned on (as in no low speed - engine would overheat while idling or in traffic, but was fine as long as the A/C was on). The fix was to replace the radiator fan resistor assembly located in the fan shroud between the fans.

Posted on Nov 12, 2008

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The fan should not come on at 104 unless you have the a/c turned on. Before you go tearing the harness apart, hit the simple things. How many miles are on it? is the cooling system in good condition; coolant, thermostat, radiator flow? Is it possible the cooling system has an air pocket in it, it is very common and will cause am overheat every time.Is it actually overheating in the first place? Newer cars run at 220-245*f . Check it with a temp probe, (in the coolant) if its not that hot and its pushing out coolant its a flow problem or possibly cylinder pressure pushing the coolant out (head gasket).

Posted on Oct 10, 2008

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Hi firstly check your fuses if ok check the cooling fan wire it direct to the battery see if it works if ok find the tempeture switch which operates the fan by connecting both wires together with ignition on see if fan works if not the relay is next after that you arse looking at wiring looms rubed through or bad grounds yates210456

Posted on Oct 08, 2008

  • paul yates Oct 13, 2008

    hi ell boy glad to see you sorted it just abit surprised you rated hotshoe 1 as helpfull yet i read his comment and was not correct yet you didn,t rate mine and i was correct a temperture switch is a cht sensor just a bit dissapointed

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0900c1528008f125.jpgFig. 1: View of the Engine Coolant Temperature (ECT) sensor 0900c1528008f126.jpgFig. 2: Engine Coolant Temperature (ECT) sensor locationTESTING
See Figures 3 and 4
  1. Remove the ECT sensor from the vehicle.
  2. Immerse the tip of the sensor in container of water.
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  4. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the engine coolant sensor temperature vs. resistance illustration.
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0900c1528008f120.jpgFig. 3: Intake Air Temperature (IAT) and Engine Coolant Temperature (ECT) sensor wiring diagram 0900c1528008f095.jpgFig. 4: ECT sensor temperature vs. resistance values

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